Migrate old traces and artifacts

What does this MR do?

It does migrate artifacts to the single unique path and stores that information in the database.

Migrates the data to remove the need of having hotfix: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/2224.

It makes it possible to remove artifacts and traces with:

rm -rf artifacts/year_month/project_id/
rm -rf builds/year_month/project_id/

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

Why was this MR needed?

Screenshots (if relevant)

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?

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/32036