Add ability to comment on moved files with no changes in merge requests

Problem to Solve

Sometimes it's necessary to move files in a project without making any other changes to those files. With the addition of #205401 (closed) we do show those files in the merge request, but #239326 (closed) prevents the ability to comment on those files.

Proposal

We should add the ability to comment on moved files so that if there is feedback (potentially about the move or maybe the content) it can be appropriately left on the change.