repo-updater: Don't record Phabricator body and form
Created by: tsenart
This commit excludes Phabricator requests body and form from VCR recordings in the source tests. This slipped through before. The token that was checked-in has been revoked. There's no risk since it had access to only public data in https://secure.phabricator.com/
Part of #3490 (closed)