[vscode] API gap: Theia master vs. VS Code 1.91

[rschnekenbu]

This bug tracks the differences between current master Theia VS Code API and VS Code 1.91:
**Warning: the release 1.91 has not been done yet, this is the evaluation on current main branch 01b9e01

Public APIs:

• [vscode] API gap: Theia master vs. VS Code 1.90 #13754
• [vscode] Support DebugSessionOptions#testRun introduced in VS Code 1.91 #13872

Declarative APIs:

• no changes seen on menu extensions

Proposed API evolution (see #13871):

• a non blocker issue was created for FileSystemWatchers: [vscode] proposed API createFileSystemWatcher #13957

Application management:

• [vscode] bump API compatibility version to 1.91.1 #13954

[rschnekenbu]

closing task as all sub tasks were also closed.