Route a small set of safe jobs to the default queue

What does this MR do?

A further step on gitlab-com/gl-infra&447 (closed), specifically gitlab-com/gl-infra/scalability#1072

Currently no sidekiq worker is listening for these named queues on gitlab.com (per the tag name) because they aren't in active use and not listening for them gave us a little CPU headroom on redis-sidekiq.

However with the routing rules approach we can now route them to the "default" queue with no added overhead. This is particularly useful as this is a nice safe operation on production because, as above, the relevant jobs are not in active use, and this also exposes Chaos::SleepWorker for testing purposes.

To be deployed as part of a change issue (TBD)

Author Check-list

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Reviewer Check-list

• Reviewed the diff jobs to confirm changes are as expected
• No changes shown in the diffs not associated with this MR - This may require a rebase or further investigation