Fix project view not updating when folders are moved or deleted

[Copilot]

The project view didn't automatically update when project folders were moved or deleted in VS Code's explorer, leaving stale paths and non-existent projects in the view.

Problem

1. Moving a project folder → Project view still showed the old path
2. Deleting a project folder → Project remained visible in the view despite being deleted

Solution

Added file system watchers to automatically track project folder changes:

• File renames/moves: Updates project URIs to reflect new paths
• File deletions: Removes deleted projects from the project view
• Nested projects: Handles projects within moved/deleted parent folders

Implementation Details

1. Enhanced workspace.apis.ts - Added onDidRenameFiles wrapper for VS Code file rename events
2. Enhanced PythonProjectManagerImpl - Added updateProjectUri() method to handle path updates
3. Enhanced ProjectView - Added event handlers:
   • handleFileRenames() - Updates project paths when folders are moved
   • handleFileDeletions() - Removes projects when folders are deleted

Testing

• Added comprehensive unit tests for the new functionality
• All existing tests continue to pass (120 passing)
• Code passes linting and TypeScript compilation

The implementation is minimal and leverages VS Code's built-in file system events for reliable tracking.

Fixes #570.

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