Log Herald rules with invalid actions via phlog()

Summary:
When Herald rules fail unexpectedly due to relying on a (now) invalid action, allow Phorge administrators to get aware by creating an entry in the error log via phlog() instead of crossing fingers that someone may from time to time get the idea to open and read Herald transcripts.

Refs T15887

Test Plan: See steps in T15887; check error log.

Reviewers: O1 Blessed Committers, avivey

Reviewed By: O1 Blessed Committers, avivey

Subscribers: avivey, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Maniphest Tasks: T15887

Differential Revision: https://we.phorge.it/D25737