Make Subscribers automatically provide working SearchFields

Summary:
Ref T8441. Ref T7715. For modern Query classes, automatically make subscriber queries and SearchField integrations work.

In particular, we can just drive this query with EdgeLogic and don't need to do anything specific on these Query classes beyond making sure they're implemented in a way that picks up all of the EdgeLogic clauses.

Test Plan:

• Searched for subscribers in Pholio, Files, Paste, and Projects.
• Searched for all other fields in Projects to check that Query changes are OK.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T7715, T8441

Differential Revision: https://secure.phabricator.com/D13191