Add "Source Control Repositories" to Source Control tab

[erikschul]

In VSCode it's possible to select which git repository you want to review changes for:

It normally searches all folders in the worksplace for git repositories and I've configured it with:

"git.autoRepositoryDetection": true,
"git.repositoryScanMaxDepth": -1,
"scm.repositories.visible": 10,
"scm.repositories.sortOrder": "path",

But I can't see it in Theia.

You may also want to add this feature :)
microsoft/vscode#206718 (comment)

@msujew