Use ApplicationSearch for Releeph branch lists

Summary:
Releeph branch lists in project views have a bunch of custom UI right now; give them more standard UI and ApplicationSearch.

This drops a small piece of functionality: we now show only a total open request count instead of a detailed enumeration of each request status. I assume this is reasonable (that is, the important piece is "is there something to do on this branch?"), but we can muck with it if the more detailed status is important.

Test Plan: {F54344}

Reviewers: btrahan

Reviewed By: btrahan

CC: LegNeato, aran

Maniphest Tasks: T3656

Differential Revision: https://secure.phabricator.com/D6764