Backfill projects where the last attempt failed

What does this MR do?

Try to backfill projects where the last attempt failed. It also fixes the mechanism to populate the tracking database correctly for projects synced before GitLab 9.0 or projects that failed during the Geo setup.

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

No.

Why was this MR needed?

Geo node status on the Geo nodes page can show repository sync as failed even when they are in sync due to another action like a new commit.

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 #1965 (closed)