Schedules repository sync when handling events in the Geo Log Cursor

What does this MR do?

Schedule the repository sync when handling the project create/update events in the Geo Log Cursor, leaving the Geo::RepositorySyncWorker responsible only for the backfill.

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

TBD

Why was this MR needed?

To reduce the synchronization delay between repositories on the secondary node.

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 #3230 (closed)