Speed up BulkCronWorker

What does this MR do and why?

This change is behind the bulk_cron_worker_auto_requeue feature flag. Rollout issue: #383076 (closed)

This change introduces auto requeuing of the bulk cron indexing workers. Currently, we only execute them once per minute. With this change they will be requeued when needed up to 60 times/minute.

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