fix(amazonq): Updating logic for getWorkspaceRelativePath in shared src for /test (#6628)

## Problem
- This will fix `Target file doesn't exist or is a directory.` issue in
unit test generation.
- If user opens project in workspace mode and try `/test` then in shared
workspaceUtils:
https://github.com/aws/aws-toolkit-vscode/blob/35502be238b1bf7c3ff73e44df8d077a6d32aa85/packages/core/src/shared/utilities/workspaceUtils.ts#L220-L236
returns the files starting from src but UTG does need values from child
level.
## Solution
Given above function with workspaceFolders as 
```
[
  {
    uri: {
      scheme: "file",
      authority: "",
      path: "/Users/Q/Downloads/TestingUTG/Sample/src",
      query: "",
      fragment: "",
      _formatted: "file:///Users/Q/Downloads/TestingUTG/Sample/src",
      _fsPath: "/Users/Q/Downloads/TestingUTG/Sample/src",
    },
    name: "src",
    index: 0,
  },
  {
    uri: {
      scheme: "file",
      authority: "",
      path: "/Users/laileni/Downloads/TestingUTG/Sample/src/Sample",
      query: "",
      fragment: "",
      _formatted: "file:///Users/Q/Downloads/TestingUTG/Sample/src/Sample",
      _fsPath: "/Users/Q/Downloads/TestingUTG/Sample/src/Sample",
    },
    name: "📦 Sample",
    index: 1,
  },
]
```

User requires the project/folder with path:
"/Users/Q/Downloads/TestingUTG/Sample/src/Sample" but right now this
gives the path from "/Users/Q/Downloads/TestingUTG/Sample/src" which
incorrectly collects the files and this is causing failures in Unit test
generation.

Example:
Expected Payload is 
```
Sample 
    - File A
    - Folder B 
    etc...
 ```
 but actual payload is 
 ```
 Sample 
    - src
       -- Sample
           --- File A
           --- Folder B 
 ```
    

-  Sort workspace folders by path length (descending) to prioritize deeper paths
### TODO: 
- Need to enable this for entire Q

---

- 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: laileni-aws

packages/amazonq/.changes/next-release/Bug Fix-ee447a9f-6a92-47c5-8e94-069c1aee46ab.json

@@ -0,0 +1,4 @@
+{
+	"type": "Bug Fix",
+	"description": "Amazon Q /test: Fixing the issue of target file does not exist."
+}

packages/core/src/codewhisperer/util/zipUtil.ts

@@ -410,9 +410,14 @@ export class ZipUtil {
             return
         }
 
-        const sourceFiles = await collectFiles(projectPaths, vscode.workspace.workspaceFolders as CurrentWsFolders, {
-            maxSizeBytes: this.getProjectScanPayloadSizeLimitInBytes(),
-        })
+        const sourceFiles = await collectFiles(
+            projectPaths,
+            vscode.workspace.workspaceFolders as CurrentWsFolders,
+            {
+                maxSizeBytes: this.getProjectScanPayloadSizeLimitInBytes(),
+            },
+            useCase
+        )
         for (const file of sourceFiles) {
             const projectName = path.basename(file.workspaceFolder.uri.fsPath)
             const zipEntryPath = this.getZipEntryPath(projectName, file.relativeFilePath)

packages/core/src/shared/utilities/workspaceUtils.ts

@@ -20,6 +20,7 @@ import fs from '../fs/fs'
 import { ChildProcess } from './processUtils'
 import { isWin } from '../vscode/env'
 import { maxRepoSizeBytes } from '../../amazonqFeatureDev/constants'
+import { FeatureUseCase } from '../../codewhisperer/models/constants'
 
 type GitIgnoreRelativeAcceptor = {
     folderPath: string
@@ -223,12 +224,20 @@ export function getWorkspaceRelativePath(
         workspaceFolders?: readonly vscode.WorkspaceFolder[]
     } = {
         workspaceFolders: vscode.workspace.workspaceFolders,
-    }
+    },
+    useCase?: FeatureUseCase
 ): { relativePath: string; workspaceFolder: vscode.WorkspaceFolder } | undefined {
     if (!override.workspaceFolders) {
         return
     }
-    for (const folder of override.workspaceFolders) {
+    let folders = override.workspaceFolders
+    if (useCase && useCase === FeatureUseCase.TEST_GENERATION) {
+        // Sort workspace folders by path length (descending) to prioritize deeper paths
+        // TODO: Need to enable this for entire Q
+        folders = [...override.workspaceFolders].sort((a, b) => b.uri.fsPath.length - a.uri.fsPath.length)
+    }
+
+    for (const folder of folders) {
         if (isInDirectory(folder.uri.fsPath, childPath)) {
             return { relativePath: path.relative(folder.uri.fsPath, childPath), workspaceFolder: folder }
         }
@@ -352,7 +361,8 @@ export async function collectFiles(
         excludeByGitIgnore?: boolean // default true
         excludePatterns?: string[] // default defaultExcludePatterns
         filterFn?: CollectFilesFilter
-    }
+    },
+    useCase?: FeatureUseCase
 ): Promise<CollectFilesResultItem[]> {
     const storage: Awaited<CollectFilesResultItem[]> = []
 
@@ -398,7 +408,7 @@ export async function collectFiles(
         const files = excludeByGitIgnore ? await filterOutGitignoredFiles(rootPath, allFiles, false) : allFiles
 
         for (const file of files) {
-            const relativePath = getWorkspaceRelativePath(file.fsPath, { workspaceFolders })
+            const relativePath = getWorkspaceRelativePath(file.fsPath, { workspaceFolders }, useCase)
             if (!relativePath) {
                 continue
             }