Merge "Null out reference to RemoteAnimationTargets when animation finishes" into sc-v2-dev am: a35786c9c5

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15616976

Change-Id: I7eed65e591c88638eb02c53b71c23a31ccc86867