Remove process_commit_worker_sticky feature flag

Jerry Setorequested to merge
556773-cleanup-process_commit_worker_sticky-flag into master

What does this MR do and why?

The process_commit_worker_sticky feature flag has been fully enabled for a while and it seems stable.

This change is to clean up the feature flag and keep the new behaviour.

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Related to #556773 (closed)

Edited by Jerry Seto

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