Process lingering animators after volume tests

The Animator inside dismissH has an endAction that postDelays on
handler. Previously we only cleared the handler queue. This CL removes
the endAction of the animator. It also advances looper time, to make
sure there are no future messages left after test tear down.

Bug: b/290612381
Test: atest VolumeDialogImplTest
Change-Id: I0518f7323eb0900bf734cdc55cf8132bd0b5523b