Add modern releeph.queryproducts and releeph.querybranches

Summary:
Ref T3662. Ref T3549. These methods are pretty conservative for now, but get the structure in place.

Also do a bunch more project -> product stuff.

Test Plan: Made calls to both methods, browsed around the UI a fair amount.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T3549, T3662

Differential Revision: https://secure.phabricator.com/D8816