Use modern ApplicationTransactions "no effect" stuff in Maniphest
Summary: Fixes T912. This was very nearly working, it just needed a little tweaking on the last mile.
Test Plan:
Made updates with no effect, and updates with an effect. Made a no-effect update and posted just the comment part.
{F129037}
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T912
Differential Revision: https://secure.phabricator.com/D8543