Notify onAnimationCancel when canceling with pending end callback

It is expected to receive cancel callback if the animator is still
running even if the last frame is done. Otherwise app may have
unexpected behavior if its onAnimationCancel and onAnimationFinish
have dependency.

Fix: 399819784
Flag: com.android.window.flags.system_ui_post_animation_end
Test: ValueAnimatorTests#testCancelOnPendingEndListener
Change-Id: Id9814fabab1feafe9f4bfb6957d6c624712720f4