Geo: Renaming a namespace fails to move project files of any subgroups properly on the secondary when hashed storage is not enabled

How to reproduce:

• Setup Geo
• Create group foo
• Create subgroup foo/bar
• Create project foo/bar/baz
• Add a file
• Add an issue with an upload
• Add a wiki
• Rename foo to qux

The repo, wiki, and upload will now be "missing" on the secondary.

TODO

• Fix bug: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/5704
• Fix another bug since it also leaves uploads behind: https://gitlab.com/gitlab-org/gitlab-ee/issues/6252 (this is a small, simple fix)
• Prevent export of orphaned files https://dev.gitlab.org/gitlab/gitlabhq/merge_requests/2453
• This issue must be confidential until https://dev.gitlab.org/gitlab/gitlabhq/merge_requests/2453 is released and backported 2 releases