Add a missing migration for transaction actors

Summary: Add a missing migration which should have been included in D9982. Harbormaster and Herald PHIDs are used as actors in some transactions.

Test Plan: Ran `./bin/storage upgrade`. Saw a transaction render correctly as "Herald assigned this task to alincoln" instead of "Unknown Object (Application) assigned this task to alincoln".

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D10028