Remove use_replica_for_mailers feature flag
What does this MR do and why?
This MR removes the use_replica_for_mailers
feature flag introduced in !116357 (merged). The details of rollout are in #408785 (closed).
Feature flag cleanup issue: #409766 (closed)
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How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
MR acceptance checklist
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Edited by Sylvester Chin