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Disable non-existent cron workers from Sidekiq redis

Sylvester Chin requested to merge sc1-remove-dangling-cron-worker into master

What does this MR do and why?

This MR removes cron workers which have been detected in gitlab-com/gl-infra/scalability#3497 (comment 2119694117).

With !165769 (merged) merged, new cron removals will be automatically dropped from the hash. However, older removed cron workers are still enqueueing jobs which get routed into an invalid queue. For customers on a single redis-sidekiq (everyone), it goes into the dead job queue.

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