Show current board for tasks in Maniphest

Summary:
Ref T1344. When rendering a task's projects, add "(Board)" afterward if the task is on a non-default board.

This is mostly a "get the data there" change, we can probably make the design nicer.

Test Plan: {F101232}

Reviewers: chad, btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T1344

Differential Revision: https://secure.phabricator.com/D7945