Update PhabricatorRepositoryManagementLookupUsersWorkflow to use ConduitCall
Summary:
Ref T2783.
This updates PhabricatorRepositoryManagementLookupUsersWorkflow to use ConduitCall to retrieve information about the commit.
Test Plan:
Ran `bin/repository lookup-users rTESTe9683b64d3283f0b2d355fdbf231bc918b5ac0ab --trace` and saw the information returned (by making a request to `diffusion.querycommits` as the omnipotent user, signed with the device key).
Mucked with `cluster.addresses` and saw requests rejected.
Reviewers: hach-que, btrahan
Reviewed By: btrahan
Subscribers: Krenair, epriestley, Korvin
Maniphest Tasks: T2783
Differential Revision: https://secure.phabricator.com/D10403