When triggering audits, respect committer identities when importing commits
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Description

When triggering audits, respect committer identities when importing commits

Summary:
Ref T13311. We currently don't use committer identity mappings when triggering audits, so if a user is only associated with an identity via manual mapping we won't treat them as the author.

Instead, use the identity and manual mapping if they're available.

Test Plan:

Pushed a commit as xyz <xyz@example.org>, an address with no corresponding user.
In the UI, manually associated that identity with user @alice.
Ran bin/repository reparse --publish <hash> to trigger audits and publishing for the commit.
Before: observed the $author_phid was null.
After: observed the $author_phid is Alice.