Revisit handling of `on_delete` in `workspaces` table migrations
The following discussion from !105783 should be addressed:
- [ ] @a_akgun started a [discussion](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/105783#note_1374346794): (+2 comments)
> Minor nitpick: We may open an issue for this and remove the comments on the foreign key references.
issue