R1:fa673dde35ef

Conpherence - finish basic application search

Summary:
Fixes T7584. Adds the ability to specify rooms, messages, or both. Adds policy icon to rooms result view and envelope icon to messages result view. Fixes a missing group by clause in thread query. Enforces having participant phid if the query isn't looking at rooms and doesn't have other particpant phids.

This last bit has a small UI quirk if the user searches for "messages" or "both" with no participant phids as we don't give them the feedback that…