Merge "Null out reference to RemoteAnimationTargets when animation finishes" into sc-v2-dev am: a35786c9c5 am: 7c90a47f5e

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

Change-Id: I5fb894f8a356ef51528c6c291371e7ef0fb95b5f