telemetry(amazonq dev): track empty path file scenario #5625

## Problem
When customer use workspaces to generate files, RTS and LLM cannot
decide which folder to deliver the generated file. We're for now
tracking how many times we reach for accountability and prioritization.

## Solution
Add telemetry to count and save the conversationIds that reach this
specific workspace usage.

PS: This is only included in VS Code since the Workspaces capability is only used here.

Author: tverney

packages/amazonq/.changes/next-release/Bug Fix-0d324321-bddd-4f93-80c4-80978930f157.json

@@ -0,0 +1,4 @@
+{
+	"type": "Bug Fix",
+	"description": "Amazon Q /dev: include telemetry for workspace usage when generating new files"
+}

packages/core/src/amazonqFeatureDev/session/sessionState.ts

@@ -61,7 +61,8 @@ function registerNewFiles(
     fs: VirtualFileSystem,
     newFileContents: NewFileZipContents[],
     uploadId: string,
-    workspaceFolders: CurrentWsFolders
+    workspaceFolders: CurrentWsFolders,
+    conversationId: string
 ): NewFileInfo[] {
     const result: NewFileInfo[] = []
     const workspaceFolderPrefixes = getWorkspaceFoldersByPrefixes(workspaceFolders)
@@ -81,6 +82,12 @@ function registerNewFiles(
                       Object.values(workspaceFolderPrefixes).find((val) => val.index === 0)?.name ?? ''
                   ]
         if (folder === undefined) {
+            telemetry.toolkit_trackScenario.emit({
+                count: 1,
+                amazonqConversationId: conversationId,
+                credentialStartUrl: AuthUtil.instance.startUrl,
+                scenario: 'wsOrphanedDocuments',
+            })
             getLogger().error(`No workspace folder found for file: ${zipFilePath} and prefix: ${prefix}`)
             continue
         }
@@ -174,7 +181,13 @@ abstract class CodeGenBase {
                 case CodeGenerationStatus.COMPLETE: {
                     const { newFileContents, deletedFiles, references } =
                         await this.config.proxyClient.exportResultArchive(this.conversationId)
-                    const newFileInfo = registerNewFiles(fs, newFileContents, this.uploadId, workspaceFolders)
+                    const newFileInfo = registerNewFiles(
+                        fs,
+                        newFileContents,
+                        this.uploadId,
+                        workspaceFolders,
+                        this.conversationId
+                    )
                     telemetry.setNumberOfFilesGenerated(newFileInfo.length)
 
                     return {
@@ -378,7 +391,13 @@ export class MockCodeGenState implements SessionState {
                 zipFilePath: f.zipFilePath,
                 fileContent: f.fileContent,
             }))
-            this.filePaths = registerNewFiles(action.fs, newFileContents, this.uploadId, this.config.workspaceFolders)
+            this.filePaths = registerNewFiles(
+                action.fs,
+                newFileContents,
+                this.uploadId,
+                this.config.workspaceFolders,
+                this.conversationId
+            )
             this.deletedFiles = [
                 {
                     zipFilePath: 'src/this-file-should-be-deleted.ts',