Cleanup CreateIterableTriggersWorker class and instances
What does this MR do and why?
Cleanup CreateIterableTriggersWorker class and instances
- final removal step as per https://docs.gitlab.com/ee/development/sidekiq/compatibility_across_updates.html#in-a-subsequent-separate-minor-release
- see #497157 (closed)
Changelog: other EE: true
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Related to #497157 (closed)