Conpherence - add application search in a few more places.

Summary: Ref T7584. In Conpherence main view, this adds a "search" link right in the "Rooms" header. This piece addresses an outstanding item on T7584. This diff also adds a search button in the durable column that takes you to the application search. This kind of a big product bet that rooms are going to be dominating things and its most useful to find another room quickly from this view. That said, I think the application search should get massaged slightly to allow searching threads and this won't be much of a trade off at all.

Test Plan: verified new search links took me to correct place and displayed reasonably.

Reviewers: chad, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T7584

Differential Revision: https://secure.phabricator.com/D12215