display folder instead of individual child files in get-errors result

[bryanchen-d]

Fixes microsoft/vscode#275945

[Copilot]

Pull Request Overview

This PR enhances the GetErrorsTool to track the input URI (file or folder path) that was used to find diagnostics, allowing the tool to display more user-friendly messages. When diagnostics are found via a folder path, the display message shows the folder rather than individual files. The changes also add directory stat support to the MockFileSystemService for testing purposes.

Key Changes:

• Modified GetErrorsTool.getDiagnostics() to track and return the inputUri for each diagnostic result
• Added logic to differentiate between exact file matches (no inputUri) and folder matches (stores folder as inputUri)
• Implemented URI deduplication in display messages to show folders instead of listing all contained files
• Enhanced MockFileSystemService to support stat() calls on mocked directories

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
src/platform/filesystem/node/test/mockFileSystemService.ts	Added support for returning stat information for mocked directories
src/extension/tools/node/getErrorsTool.tsx	Added inputUri tracking to diagnostic results, implemented deduplication logic for display URIs, and minor formatting changes
src/extension/tools/node/test/getErrorsTool.spec.tsx	Added file system service setup and updated test expectations to include inputUri field for folder path tests