Revert "Update Maqetta submodules in postFetch stage."

This reverts commit 059e55355e324ecd6afe61f03f3f2a375e5fc3ca.
Revert "See if we really need to clone Maqetta code "manually"."

This reverts commit e039f85a275b9da8a58cd422e631e42b1c6df779.
Add code to update existing Maqetta Git repo.

Also clean up cloning task.
Add explanatory comment.