R1:d94129b739bc

Migrate "PhabricatorOwnersPackageCommitRelationship" to "PhabricatorRepositoryAuditRequest"

Summary:
- Move table to Repository, since we have no Owners joins in the application anymore but would like to do a Repository join.
- Rename "packagePHID" to "auditorPHID", since this column may contain package, project, or user PHIDs.

Test Plan:
- Browsed Owners, Audit, and Differential interfaces to the Audit tool.
- Made comments and state changes.
- Ran "reparse.php --herald --owners" on several…