R1:6f80a04699f8

Paginate the profile badges view

Summary: Ref T12270. Adds a pager, plus a few little cleanups from copy/paste and accumulated cruft.

Test Plan:
- Paginated a user with 180 badges.
- Viewed a user with 0 badges.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12270

Differential Revision: https://secure.phabricator.com/D17561