Sort out application crumbs in new repository edit workflow
Summary: Ref T2231. Crumbs in the Diffusion edit workflow are a bit wonky, with stuff like "rP (master)" which isn't very useful and no link back to the main "Edit" page. Make them consistent across all the screens.
Test Plan: Loaded a bunch of these screens and saw sane crumbs on all of them.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T2231
Differential Revision: https://secure.phabricator.com/D7407