Add test repos for ABAP Language Version

[mbtools]

Current tests at https://github.com/abapGit-tests use "ABAP Language Version = Any" which is the default

To-Dos:

• [ ] Add test repo for ABAP Language Version = Standard
• [x] Add test repo for ABAP Language Version = Key User
• [ ] Add test repo for ABAP Language Version = Cloud Development
• [ ] Test CI process with above repos

[albertmink]

Started with this one here (open to naming suggestions ;) ) https://github.com/abapGit-tests/CLAS_KEY_USER

I simply wanted to demo the feature and created the repository right away.

[mbtools]

That's fine for now. I don't have much time to work on this topic but will finish the UI work in AG soon :-)