Update BG migration cops for ci database worker

What does this MR do and why?

Update a couple cops to correctly detect or ignore offenses for the ci background migration worker being added in !79064 (merged).

The CiDatabaseWorker should have the same behavior as the existing BackgroundMigrationWorker, so the cops should consistently alert for offenses on either worker.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #343047 (closed)