Support Spaces in Maniphest
Ref T8493. Tricks:
- "Create Similar Task" and "Create Subtask" should copy the parent's Space.
- Normal list view + workboard card view.
- Created a task, edited space, etc.
- Viewed tasks with different users.
- Created a "Similar Task" (saw proper Space).
- Created a subtask (saw proper Space).
- Viewed workboard.
Reviewed By: btrahan
Maniphest Tasks: T8493
Differential Revision: https://secure.phabricator.com/D13232