Revert addition of add/removeAnimationListener

This reverts commit 02301df2
and 65d2171d.

Dropped addition of new API because androidx's FragmentManagerImpl now
employs a workaround that removes the necessity to reflect into
mListener and doesn't need add/removeAnimationListener either.

Bug: 117519981
Test: atest AnimationTest
Change-Id: I7250570190f40f6c5da8ef65ed81b2d4bb815cf5