Remove shield for Conduit API responses
Summary: 'cuz we don't need it and it's lame complexity for API clients of all kinds. Rip the band-aid off now.
Test Plan: used conduit console and verified no more shield. also did some JS stuff around the suite to verify I didn't kill JS
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Korvin
Maniphest Tasks: T891
Differential Revision: https://secure.phabricator.com/D3265