Merge branch '20302-forking-a-project-from-one-storage-to-another-fails' into 'master'

Fix a bug where forking a project from a repository storage to another would fail

## What does this MR do?

Fix a bug where forking a project from a repository storage to another would fail.

## Are there points in the code the reviewer needs to double check?

No

## Why was this MR needed?

If you have a project in storage_a, change the default storage to storage_b, and attempt to fork said project, the import will fail.

## What are the relevant issue numbers?

Closes #20302 

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [x] Added for this feature/bug
  - [ ] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)
- [ ] Merge https://gitlab.com/gitlab-org/gitlab-shell/merge_requests/75, publish the tag, and update `GITLAB_SHELL_VERSION`


See merge request !5509

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