Audit Feed: less verbose when the author is the committer
If the author and the committer are the same person, do not show them twice.
UsernameFoo committed <commit hash>: <commit msg> (authored by UsernameFoo).
UsernameFoo committed <commit hash>: <commit msg>
This only affects the feed.
Test Plan: Do some mixed commits and visit /feed/query/all/. No nuclear implosions.
Reviewers: O1 Blessed Committers, speck
Reviewed By: O1 Blessed Committers, speck
Subscribers: speck, tobiaswiese, Matthew, Cigaryno
Maniphest Tasks: T15528
Differential Revision: https://we.phorge.it/D25421