Add "project was moved" error messages for git

What does this MR do?

Adds helpful error messages to git rejections when you push/pull a project that was moved. This is a direct follow-on to !10370 (closed).

Moved branch to gitlab-org/gitlab-ce to avoid job timeouts and also to run EE compatibility check (there are minor conflicts with EE master). Previous MR https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/11107

Tasks

• Test git actions locally
• https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10370#note_28858283
• https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10370#note_28858492
• https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10370#note_28858546

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

Why was this MR needed?

When a project is renamed or transferred, or if its namespace is renamed, any git commands on the old URI will fail. This will help users to quickly fix their remotes and get back to what they were trying to do.

Screenshots

As root user, pulling a public repo after it was renamed from foo to food

As root user, pulling a private repo owned by root after it was renamed from foo to food

(Same as above)

As random user, attempting to pull a public repo owned by root after it was renamed from foo to food

(Same as above)

As random user, attempting to pull a private repo owned by root after it was renamed from foo to food

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

#17361 (closed)