[lib] flip usingCommServicesAccessToken to true

Summary: we'll flip this back to false for releases, but we're ready to flip it to true for devs

Test Plan: extensive testing of all the identity RPCs from web/native/keyserver

Reviewers: bartek, inka, marcin

Reviewed By: bartek, inka, marcin

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D12553