can now tell phabricator you trust an auth provider's emails (useful for Google OAuth), which will mark emails as "verified" and will skip email verification.
Summary: This is useful when you're trying to onboard an entire office and you end up using the Google OAuth anyway.
Test Plan: tested locally. Maybe I should write some tests?
Reviewers: #blessed_reviewers, epriestley
Reviewed By: #blessed_reviewers, epriestley
Subscribers: epriestley, Korvin
Differential Revision: https://secure.phabricator.com/D9150