Link proxy column headers on workboards to proxied projects
Summary: Ref T10010. Allows you to click "Milestone 99" to jump directly to that project.
Test Plan:
- Clicked milestone header, went to milestone.
- Clicked normal column header, nothing happened. Wow!
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T10010
Differential Revision: https://secure.phabricator.com/D15204