add logging to repository check worker

What does this MR do?

Adds more logging to SingleRepositoryCheckWorker

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

No

Why was this MR needed?

We're seeing some issues in the repository check process that are difficult to troubleshoot without more logs

What are the relevant issue numbers?

none

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• [ y ] CHANGELOG entry added
• [ n/a ] Documentation created/updated
• [n/a ] API support added
• Tests
  • [ n/a ] Added for this feature/bug
  • [ n/a ] All builds are passing
• [ y ] Conform by the style guides
• [ y ] Branch has no merge conflicts with master (if you do - rebase it please)
• [ y ] Squashed related commits together