Workspace Trust API to support newer VS Code Git plugins

[martin-fleck-at]

When creating an electron application with the latest VS Code built-in Git plugins:

  "theiaPlugins": {
    "vscode-builtin-git": "https://open-vsx.org/api/vscode/git/1.62.3/file/vscode.git-1.62.3.vsix",
    "vscode-builtin-github": "https://open-vsx.org/api/vscode/github/1.62.3/file/vscode.github-1.62.3.vsix",
    "vscode-builtin-github-authentication": "https://open-vsx.org/api/vscode/github-authentication/1.62.3/file/vscode.github-authentication-1.62.3.vsix",
    ...
  }

I get the following error while trying to add a remote repository with Source Control View > Remote > Add Remote...:

I believe the reason for that is that the Git plugin uses some API that Theia does not provide: Trusted workspace API:

// Don't allow auto-fetch in untrusted workspaces
if (workspace.isTrusted) {
   this.disposables.push(new AutoFetcher(this, globalState));
} else {
   const trustDisposable = workspace.onDidGrantWorkspaceTrust(() => {
      trustDisposable.dispose();
      this.disposables.push(new AutoFetcher(this, globalState));
   });
   this.disposables.push(trustDisposable);
}

https://github.com/microsoft/vscode/blob/bfad20be9d75fa83c1d3e31fb6aefbca71aeaddc/extensions/git/src/repository.ts#L942

From what I can see, the isTrusted is false and the onDidGrantWorkspaceTrust does not exist causing the error.

Feature Description:

Implement (a very light-weight version of) the Workspace Trust API:

• At least provide the isTrusted flag to plugins
• Support the onDidGrantWorkspaceTrust event to which plugins might be registered
• Add a dialog to query the user about workspace trust to fire the event based on the users answer

The full functionality is described in https://code.visualstudio.com/docs/editor/workspace-trust

[marcdumais-work]

This should work now, thanks to #10473