Replace workboard task creation with EditEngine

Summary: Ref T9908. This is the last of the things that need to swap over.

Test Plan:

• Created tasks from a workboard.
• Created tasks in different columns.
• Edited tasks.
• Used ?parent=...
• Verified that default edit form config now affects comment actions.
• No more weird comment thing on forms, at least for now.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9908

Differential Revision: https://secure.phabricator.com/D14715