Remove UI warnings about policies being a janky mess
Summary: Ref T603. While policies aren't completely perfect, they are substantially functional to the best of my knowledge -- definitely in good enough shape that we want to hear about issues with them, now.
Test Plan: Edited a task, repository, and project.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T603
Differential Revision: https://secure.phabricator.com/D7343