make "browse in diffusion" action work for commits in branches other than master
Summary: we do this by passing the "seenOnBranches" commit data detail through the stack
Test Plan: browse in diffusion link worked for non-master checkins under git
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Korvin
Maniphest Tasks: T1949
Differential Revision: https://secure.phabricator.com/D3853