test(lambda): fix integration test failure in appBuilder (aws#6733)

## Problem
There is a side effect from `sandbox.spy(AppBuilderRootNode.instance)`
between two integration tests for AppBuilder causing test failure due to
**_`TypeError: Attempted to wrap onDidChangeChildren which is already
wrapped`_**`

```
 1) "before each" hook for "creates an AppBuilderRootNode with correct label":
     TypeError: Attempted to wrap onDidChangeChildren which is already wrapped
      at checkWrappedMethod (/Volumes/workplace/Lambda Tooling/aws-toolkit-vscode/node_modules/sinon/lib/sinon/util/core/wrap-method.js:64:21)
      at wrapMethod (/Volumes/workplace/Lambda Tooling/aws-toolkit-vscode/node_modules/sinon/lib/sinon/util/core/wrap-method.js:135:13)
      at spy (/Volumes/workplace/Lambda Tooling/aws-toolkit-vscode/node_modules/sinon/lib/sinon/spy.js:180:16)
      at /Volumes/workplace/Lambda Tooling/aws-toolkit-vscode/node_modules/sinon/lib/sinon/util/core/walk-object.js:33:17
      at /Volumes/workplace/Lambda Tooling/aws-toolkit-vscode/node_modules/sinon/lib/sinon/util/core/walk.js:27:22
      at Array.forEach (<anonymous>)
      at walkInternal (/Volumes/workplace/Lambda Tooling/aws-toolkit-vscode/node_modules/sinon/lib/sinon/util/core/walk.js:19:5)
      at walk (/Volumes/workplace/Lambda Tooling/aws-toolkit-vscode/node_modules/sinon/lib/sinon/util/core/walk.js:48:12)
      at walkObject (/Volumes/workplace/Lambda Tooling/aws-toolkit-vscode/node_modules/sinon/lib/sinon/util/core/walk-object.js:18:5)
      at Function.spy (/Volumes/workplace/Lambda Tooling/aws-toolkit-vscode/node_modules/sinon/lib/sinon/spy.js:170:16)
      at Sandbox.spy (/Volumes/workplace/Lambda Tooling/aws-toolkit-vscode/node_modules/sinon/lib/sinon/sandbox.js:383:35)
      at Context.<anonymous> (/Volumes/workplace/Lambda Tooling/aws-toolkit-vscode/packages/core/src/testInteg/appBuilder/serverlessLand/main.test.ts:34:28)
  --------------
  Error: Stack Trace for original
      at extendObjectWithWrappedMethods (/Volumes/workplace/Lambda Tooling/aws-toolkit-vscode/node_modules/sinon/lib/sinon/util/core/wrap-method.js:169:34)
      at wrapMethod (/Volumes/workplace/Lambda Tooling/aws-toolkit-vscode/node_modules/sinon/lib/sinon/util/core/wrap-method.js:157:5)
      at spy (/Volumes/workplace/Lambda Tooling/aws-toolkit-vscode/node_modules/sinon/lib/sinon/spy.js:180:16)
      at /Volumes/workplace/Lambda Tooling/aws-toolkit-vscode/node_modules/sinon/lib/sinon/util/core/walk-object.js:33:17
      at /Volumes/workplace/Lambda Tooling/aws-toolkit-vscode/node_modules/sinon/lib/sinon/util/core/walk.js:27:22
      at Array.forEach (<anonymous>)
      at walkInternal (/Volumes/workplace/Lambda Tooling/aws-toolkit-vscode/node_modules/sinon/lib/sinon/util/core/walk.js:19:5)
      at walk (/Volumes/workplace/Lambda Tooling/aws-toolkit-vscode/node_modules/sinon/lib/sinon/util/core/walk.js:48:12)
      at walkObject (/Volumes/workplace/Lambda Tooling/aws-toolkit-vscode/node_modules/sinon/lib/sinon/util/core/walk-object.js:18:5)
      at Function.spy (/Volumes/workplace/Lambda Tooling/aws-toolkit-vscode/node_modules/sinon/lib/sinon/spy.js:170:16)
      at Sandbox.spy (/Volumes/workplace/Lambda Tooling/aws-toolkit-vscode/node_modules/sinon/lib/sinon/sandbox.js:383:35)
      at Context.<anonymous> (/Volumes/workplace/Lambda Tooling/aws-toolkit-vscode/packages/core/src/testInteg/appBuilder/sidebar/appBuilderNode.test.ts:35:28)
      at Context.fn (/Volumes/workplace/Lambda Tooling/aws-toolkit-vscode/packages/core/src/test/setupUtil.ts:34:24)
      at processImmediate (node:internal/timers:483:21)
      at process.topLevelDomainCallback (node:domain:161:15)
      at process.callbackTrampoline (node:internal/async_hooks:128:24)
```

## Solution

Add additional layer of `describe()`. 

Test result: 
```
Walkthrough pattern URL exists
    ✔ Walkthrough pattern URL exists for APIdotnet (623ms)
    ✔ Walkthrough pattern URL exists for APInode (510ms)
    ✔ Walkthrough pattern URL exists for APIpython (473ms)
    ✔ Walkthrough pattern URL exists for APIjava (559ms)
    ✔ Walkthrough pattern URL exists for S3dotnet (584ms)
    ✔ Walkthrough pattern URL exists for S3node (525ms)
    ✔ Walkthrough pattern URL exists for S3python (566ms)
    ✔ Walkthrough pattern URL exists for S3java (560ms)
  Application Builder
    root node
      ✔ creates an AppBuilderRootNode with correct label
      ✔ generates correct number of children nodes: walkthrough node + project nodes
    application nodes in workspace (Test in order)
      ✔ 1: contains application node for appbuilder-test-app
      ✔ 2: contains correct application node properties
      ✔ 3: contains correct resource node properties (4266ms)
      ✔ 4: has registered refresh command successfully
      ✔ 5: triggers auto refresh when there a file getting updated (509ms)
  Happy Path
    ✔ creates project from Serverless Land integration (1083ms)
  16 passing (10s)
globalSetup: after()
deleteTestTempDirs: deleted 2 test temp dirs

```
---

- Treat all work as PUBLIC. Private `feature/x` branches will not be
squash-merged at release time.
- Your code changes must meet the guidelines in
[CONTRIBUTING.md](https://github.com/aws/aws-toolkit-vscode/blob/master/CONTRIBUTING.md#guidelines).
- License: I confirm that my contribution is made under the terms of the
Apache 2.0 license.

Author: vicheey

packages/core/src/testInteg/appBuilder/serverlessLand/main.test.ts

@@ -25,114 +25,120 @@ describe('Serverless Land Integration', async () => {
     const parseMetadata = JSON.parse(metadataContent) as ProjectMetadata
     const workspaceFolder = vscode.workspace.workspaceFolders![0]
     const projectFolder = 'my-project-from-Serverless-Land'
-    let rootNode: sinon.SinonSpiedInstance<AppBuilderRootNode>
-    let sandbox: sinon.SinonSandbox
 
-    beforeEach(async () => {
-        sandbox = sinon.createSandbox()
-        await fs.delete(path.join(workspaceFolder.uri.fsPath, projectFolder), { recursive: true })
-        rootNode = sandbox.spy(AppBuilderRootNode.instance)
-    })
+    // Additional layer of describe() needed here to prevent side effect from
+    // `sandbox.spy(AppBuilderRootNode.instance)`
+    describe('Happy Path', async () => {
+        let rootNode: sinon.SinonSpiedInstance<AppBuilderRootNode>
+        let sandbox: sinon.SinonSandbox
 
-    afterEach(async () => {
-        await fs.delete(path.join(workspaceFolder.uri.fsPath, projectFolder), { recursive: true })
-        sandbox.restore()
-    })
+        beforeEach(async () => {
+            sandbox = sinon.createSandbox()
+            rootNode = sandbox.spy(AppBuilderRootNode.instance)
+            await fs.delete(path.join(workspaceFolder.uri.fsPath, projectFolder), { recursive: true })
+        })
+
+        afterEach(async () => {
+            await fs.delete(path.join(workspaceFolder.uri.fsPath, projectFolder), { recursive: true })
+            sandbox.restore()
+        })
 
-    it('creates project from Serverless Land integration', async () => {
-        /**
-         * Selection:
-         *  - pattern               : [Select]  2   apigw-rest-api-lambda-sam
-         *  - runtime               : [Select]  3   dotnet
-         *  - iac                   : [Select]  1   sam
-         *  - location              : [Input]   From TestFolder.uri
-         *  - name                  : [Input]   "my-project-from-Serverless-Land"
-         */
+        it('creates project from Serverless Land integration', async () => {
+            /**
+             * Selection:
+             *  - pattern               : [Select]  2   apigw-rest-api-lambda-sam
+             *  - runtime               : [Select]  3   dotnet
+             *  - iac                   : [Select]  1   sam
+             *  - location              : [Input]   From TestFolder.uri
+             *  - name                  : [Input]   "my-project-from-Serverless-Land"
+             */
 
-        const testWindow = getTestWindow()
-        const prompterTester = PrompterTester.init({ testWindow })
-            .handleQuickPick('Select a Pattern for your application', async (quickPick) => {
-                await quickPick.untilReady()
-                const options = quickPick.items
-                Object.entries(parseMetadata.patterns).map(([key, pattern]) => {
-                    options.find((option) => option.label === key && option.detail === pattern.description)
+            const testWindow = getTestWindow()
+            const prompterTester = PrompterTester.init({ testWindow })
+                .handleQuickPick('Select a Pattern for your application', async (quickPick) => {
+                    await quickPick.untilReady()
+                    const options = quickPick.items
+                    Object.entries(parseMetadata.patterns).map(([key, pattern]) => {
+                        options.find((option) => option.label === key && option.detail === pattern.description)
+                    })
+                    quickPick.acceptItem(quickPick.items[1])
                 })
-                quickPick.acceptItem(quickPick.items[1])
-            })
-            .handleQuickPick('Select Runtime', async (quickPick) => {
-                await quickPick.untilReady()
-                const options = quickPick.items
-                assert.strictEqual(options[0].label, 'python')
-                assert.strictEqual(options[1].label, 'javascript')
-                assert.strictEqual(options[2].label, 'java')
-                assert.strictEqual(options[3].label, 'dotnet')
-                quickPick.acceptItem(options[3])
-            })
-            .handleQuickPick('Select IaC', async (quickPick) => {
-                await quickPick.untilReady()
-                const options = quickPick.items
-                assert.strictEqual(options[0].label, 'sam')
-                quickPick.acceptItem(options[0])
-            })
-            .handleQuickPick('Select Project Location', async (quickPick) => {
-                await quickPick.untilReady()
-                const options = quickPick.items
-                assert.strictEqual(options[0].label, '$(folder) workspaceFolder')
-                assert.strictEqual(options[1].label, '$(folder-opened) Select a folder...')
-                quickPick.acceptItem(options[0])
-            })
-            .handleInputBox('Enter Project Name', (inputBox) => {
-                inputBox.acceptValue('my-project-from-Serverless-Land')
+                .handleQuickPick('Select Runtime', async (quickPick) => {
+                    await quickPick.untilReady()
+                    const options = quickPick.items
+                    assert.strictEqual(options[0].label, 'python')
+                    assert.strictEqual(options[1].label, 'javascript')
+                    assert.strictEqual(options[2].label, 'java')
+                    assert.strictEqual(options[3].label, 'dotnet')
+                    quickPick.acceptItem(options[3])
+                })
+                .handleQuickPick('Select IaC', async (quickPick) => {
+                    await quickPick.untilReady()
+                    const options = quickPick.items
+                    assert.strictEqual(options[0].label, 'sam')
+                    quickPick.acceptItem(options[0])
+                })
+                .handleQuickPick('Select Project Location', async (quickPick) => {
+                    await quickPick.untilReady()
+                    const options = quickPick.items
+                    assert.strictEqual(options[0].label, '$(folder) workspaceFolder')
+                    assert.strictEqual(options[1].label, '$(folder-opened) Select a folder...')
+                    quickPick.acceptItem(options[0])
+                })
+                .handleInputBox('Enter Project Name', (inputBox) => {
+                    inputBox.acceptValue('my-project-from-Serverless-Land')
+                })
+                .build()
+
+            // Validate that the README.md is shown.
+            testWindow.onDidChangeActiveTextEditor((editors) => {
+                assert(editors)
+                const readMe = path.join(workspaceFolder.uri.fsPath, projectFolder, 'README.md')
+                assert.strictEqual(editors?.document.fileName, readMe)
             })
-            .build()
 
-        // Validate that the README.md is shown.
-        testWindow.onDidChangeActiveTextEditor((editors) => {
-            assert(editors)
-            const readMe = path.join(workspaceFolder.uri.fsPath, projectFolder, 'README.md')
-            assert.strictEqual(editors?.document.fileName, readMe)
-        })
+            await vscode.commands.executeCommand('aws.toolkit.lambda.createServerlessLandProject')
 
-        await vscode.commands.executeCommand('aws.toolkit.lambda.createServerlessLandProject')
+            // projectNodes set from previous step
 
-        // projectNodes set from previous step
+            const projectNode = await rootNode
+                .getChildren()
+                .then(
+                    (children) =>
+                        children.find(
+                            (node) =>
+                                node instanceof AppNode &&
+                                node.label === 'workspaceFolder/my-project-from-Serverless-Land'
+                        ) as AppNode | undefined
+                )
 
-        const projectNode = await rootNode
-            .getChildren()
-            .then(
-                (children) =>
-                    children.find(
-                        (node) =>
-                            node instanceof AppNode && node.label === 'workspaceFolder/my-project-from-Serverless-Land'
-                    ) as AppNode | undefined
-            )
+            assert.ok(projectNode, 'Expect Serverless Land project node in Application Builder')
 
-        assert.ok(projectNode, 'Expect Serverless Land project node in Application Builder')
+            // Check App Builder resources
+            const resourceNodes = await projectNode.getChildren()
+            assert.strictEqual(resourceNodes.length, 1)
+            assert.ok(resourceNodes[0] instanceof ResourceNode)
 
-        // Check App Builder resources
-        const resourceNodes = await projectNode.getChildren()
-        assert.strictEqual(resourceNodes.length, 1)
-        assert.ok(resourceNodes[0] instanceof ResourceNode)
+            // Validate Lambda resource configuration
+            const lambdaResource = resourceNodes[0] as ResourceNode
+            assert.strictEqual(lambdaResource.resource.resource.Type, 'AWS::Serverless::Function')
+            assert.strictEqual(lambdaResource.resource.resource.Runtime, 'dotnet8')
+            assert.strictEqual(lambdaResource.resource.resource.Id, 'HelloWorldFunction')
+            assert.deepStrictEqual(lambdaResource.resource.resource.Events, [
+                {
+                    Id: 'HelloWorld',
+                    Type: 'Api',
+                    Path: '/hello',
+                    Method: 'get',
+                },
+            ])
+            assert.deepStrictEqual(lambdaResource.resource.resource.Environment, {
+                Variables: {
+                    PARAM1: 'VALUE',
+                },
+            })
 
-        // Validate Lambda resource configuration
-        const lambdaResource = resourceNodes[0] as ResourceNode
-        assert.strictEqual(lambdaResource.resource.resource.Type, 'AWS::Serverless::Function')
-        assert.strictEqual(lambdaResource.resource.resource.Runtime, 'dotnet8')
-        assert.strictEqual(lambdaResource.resource.resource.Id, 'HelloWorldFunction')
-        assert.deepStrictEqual(lambdaResource.resource.resource.Events, [
-            {
-                Id: 'HelloWorld',
-                Type: 'Api',
-                Path: '/hello',
-                Method: 'get',
-            },
-        ])
-        assert.deepStrictEqual(lambdaResource.resource.resource.Environment, {
-            Variables: {
-                PARAM1: 'VALUE',
-            },
+            prompterTester.assertCallAll()
         })
-
-        prompterTester.assertCallAll()
     })
 })