Conpherence - unit tests for T7670
Summary: Ref T7670. Add a few unit tests to make sure deleting everyone works. Also change remaining processRequest to handleRequest while in there.
Test Plan: arc unit passed
Reviewers: chad, epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T7670
Differential Revision: https://secure.phabricator.com/D12179