Move Setup Issues into it's own notification style menu

Summary: Ref T11132. This gets rid of the red bar for admins and instead shows a new menu item next to notifications/chat if there are unresolved configuration issues. Menu goes away if there are no issues. May move this later into the bell icon, but think think might be the right place to start especially for NUX and updates. Maybe limit the number of items?

Test Plan:
Tested with some, lots, and no config issues.

{F1790156}

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T11132

Differential Revision: https://secure.phabricator.com/D16461