(stable) Restrict watching and member project display better
Summary: Fixes T12713. We don't need to show watching and member info on other views other than ApplicationSearch (for now) so add a few methods to restrict the calls.
Test Plan: Visit project search, profile, project home, project home with subprojects
Reviewed By: epriestley
Maniphest Tasks: T12713
Differential Revision: https://secure.phabricator.com/D17883