Add forge now: prepare fields for inbound email processing
- add raw message field to request history table, and relevant view to access it
- add email as choice for the request history actor roles, when the message can't be matched to a known actor
Depends on !810 (closed).
Test Plan
added a couple of python tests for this. Testing the new link in cypress will happen when we hook up email processing
Migrated from D7799 (view on Phabricator)