Schedule OverviewCommandHelper callbacks for GroupedTaskView

* Schedule runnables to clear pending queue in
OverviewCommandHelper similar to how TaskView does it.
* End callbacks get run when recents animation finishes in
RecentsView in the case of live tile when recents animation
is still running
OR
in directly when the split remote animation finishes

Bug: 207845542
Change-Id: I7e858ce55b08cde6436d44f2e857e28b73458f0b