Move commits to the "COMMIT" mail prefix
36d9908e6cd1
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Description

Move commits to the "COMMIT" mail prefix

Summary:
Fixes T9427. Currently, replies to audits/commits go to "Cxxx", but so do replies to countdowns.

There is non real non-disruptive approach available here and this seems least-bad.

Test Plan:

Made a comment on a commit.
Fished the reply-to address out of bin/mail list-oubound + bin/mail show-outbound (it was now "COMMIT...").
Sent mail to that address.
Grabbed the raw message and wrote it to mail.txt.
Ran cat mail.txt | ./scripts/mail/mail_handler.php --process-duplicates.
Used bin/mail list-inbound + bin/mail show-inbound to verify receipt.
Saw comment appear on audit.