R1:63bbe6b129f0

Port "Allow Dangerous Changes" to new Manage UI

Summary: Ref T10748. Brings this forward in the UI and EditEngine.

Test Plan:
- Edited via Conduit.
- Viewed via Manage UI.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10748

Differential Revision: https://secure.phabricator.com/D15805