Remove several pieces of audit-related code

Summary: Ref T10978. This code (mostly related to the old ADD_AUDIT transaction and some to the "store English text in the database" audit reasons) is no longer reachable.

Test Plan:
Grepped for removed symbols:

  - withAuditStatus
  - getActionNameMap (unrelated callsites exist)
  - getActionName (unrelated callsites exist)
  - getActionPastTenseVerb
  - addAuditReason
  - getAuditReasons
  - auditReasonMap

Also audited some commits.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10978

Differential Revision: https://secure.phabricator.com/D17267

src/applications/diffusion/query/DiffusionCommitQuery.php

@@ -135,14 +135,6 @@ final class DiffusionCommitQuery
     return $this;
   }
 
-  public function withAuditStatus($status) {
-    // TODO: Replace callers with `withStatuses()`.
-    return $this->withStatuses(
-      array(
-        $status,
-      ));
-  }
-
   public function withEpochRange($min, $max) {
     $this->epochMin = $min;
     $this->epochMax = $max;