Remove some ad-hoc loading of repositories from Releeph

Summary: Ref T3551. Since we now require repositories in order to perform policy checks, things that did loads properly don't need to load this data explicitly.

Test Plan: Edited a product, cut a new branch.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T3551

Differential Revision: https://secure.phabricator.com/D8769