Upgrade (most) Differential API callsites to "differential.revision.search"

Summary: Ref T13490. The "RevisionRef" is currently based on "differential.query" data, but all calls other than the hash-based lookup can move to "differential.revision.search".

Test Plan: Ran revision workflows like arc inspect and arc browse.

Maniphest Tasks: T13490

Differential Revision: https://secure.phabricator.com/D21099