Add repository list-paths and repository move-paths
Summary: Ref T7149. These formalize the local path adjustment step for cluster imports, rather than relying on an ad-hoc script.
Test Plan: Used list-paths and move-paths to list and move repositories.
Reviewed By: btrahan
Maniphest Tasks: T7149
Differential Revision: https://secure.phabricator.com/D13621