Summary: Ref T9908. This drives workboard card edits through the new stuff. Bit of copy-paste but the old one will get deleted soon.

Test Plan:
  - Edited some cards.
  - Changed priority on a priority-sorted board, saw proper re-sort
  - Removed board project, saw card vanish properly.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9908

Differential Revision: https://secure.phabricator.com/D14712