fixes SprintBoardTaskEditController

Bug: T85060
Change-Id: I667f1446d46e6bb43dcc31fdc4eb0ede3c6e1cce
fix subtask creation problem

Directly related to new ManiphestTaskQuery implementation for
Bug: T85060

Change-Id: I7bc715f91847eb7be3a4a2c3f4cf3eba20e274c8
adds SprintUIEventListener

creates a new route for direct link to Sprint Board from Tasks
also adds Subtasks to SprintCard
adds Sprint Board button in BurndownView

Change-Id: I3a3015498d9a371322749999973d4713abe9f644
Merge commit '281986b6ce8cfa4887095e8e0bdc80420002e490'