Add rulePHID to HeraldEffect
Summary: Ref T4195. Herald rules gained PHIDs only recently, propagate them to HeraldEffect to make some of the hook stuff eaiser.
Test Plan: iiam
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T4195
Differential Revision: https://secure.phabricator.com/D7781