fix(tests): use node:fs when globals are not initialized #5772

## Problem
In
https://github.com/aws/aws-toolkit-vscode/blob/16aa3684f479566bfcf6a9e33f88e70039831e9a/packages/core/src/test/globalSetup.test.ts#L48,
we use our fs.fs module which accesses globals.isWeb, but globals are not initialized yet.

```
Exception has occurred: Error: ToolkitGlobals accessed before initialize()
  at Object.get (/Volumes/workplace/aws-toolkit-vscode/packages/core/src/shared/extensionGlobals.ts:109:23)
    at FileSystem.get isWeb [as isWeb] (/Volumes/workplace/aws-toolkit-vscode/packages/core/src/shared/fs/fs.ts:689:24)
    at FileSystem.mkdir (/Volumes/workplace/aws-toolkit-vscode/packages/core/src/shared/fs/fs.ts:94:63)
    at Runner.<anonymous> (/Volumes/workplace/aws-toolkit-vscode/packages/core/src/test/globalSetup.test.ts:48:18)
```

To reproduce, go into master, run any test file individually with
"Extension Tests (current file) (amazonq)".

## Solution
Use node's fs when setting up tests since we must wait for global
context to be initialized to use our fs.

Author: Hweinstock

packages/core/src/test/globalSetup.test.ts

@@ -26,9 +26,9 @@ import { GlobalState } from '../shared/globalState'
 import { FeatureConfigProvider } from '../shared/featureConfig'
 import { mockFeatureConfigsData } from './fake/mockFeatureConfigData'
 import { fs } from '../shared'
+import { promises as nodefs } from 'fs' //eslint-disable-line no-restricted-imports
 
 disableAwsSdkWarning()
-
 const testReportDir = join(__dirname, '../../../../../.test-reports') // Root project, not subproject
 const testLogOutput = join(testReportDir, 'testLog.log')
 const globalSandbox = sinon.createSandbox()
@@ -42,10 +42,9 @@ let openExternalStub: sinon.SinonStub<Parameters<(typeof vscode)['env']['openExt
 export async function mochaGlobalSetup(extensionId: string) {
     return async function (this: Mocha.Runner) {
         // Clean up and set up test logs
-        try {
-            await fs.delete(testLogOutput)
-        } catch (e) {}
-        await fs.mkdir(testReportDir)
+        // Use nodefs instead of our fs module (which uses globals.isWeb, which is not initialized yet).
+        await nodefs.rm(testLogOutput, { force: true })
+        await nodefs.mkdir(testReportDir, { recursive: true })
 
         sinon.stub(FeatureConfigProvider.prototype, 'listFeatureEvaluations').resolves({
             featureEvaluations: mockFeatureConfigsData,