R1:e25a40236fe2

Nearly complete lifting card-move code out of workboards

Summary: Ref T10010. This gets rid of the last dependency on the weird ColumnPositionQuery code.

Test Plan:
- Viewed workboards.
- Used batch editor.
- Created a new workboard.
- Dragged stuff around.
- Created new tasks into columns.
- Changed order from natural to priority, dragged things around.
- Switched filter to custom filter, "all tasks", etc.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10010

Differential Revision…