Merge "Null out RemoteTargetHandles as soon as finishing recents is requested" into sc-v2-dev am: 759e15fe45

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15661931

Change-Id: I31ed76ec3ea6394ddd42a4530d1e1c8635e52b0a