R1:aaf22695515a

Remove legacy numeric Audit status constants

Summary: Depends on D19655. Ref T13197. These no longer have callers.

Test Plan: Grepped for these constants.

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13197

Differential Revision: https://secure.phabricator.com/D19656