Make branch status more clear on Diffusion branches view

Summary:
See PHI1225. Ref T13277. In Diffusion, show "default", "permanent", or "not permanent" when looking at branches.

For repositories with 100 or fewer branches, put default and permanent branches on top.

Test Plan:

Reviewers: amckinley

Reviewed By: amckinley

Subscribers: leoluk

Maniphest Tasks: T13277

Differential Revision: https://secure.phabricator.com/D20493