Merge "Add spring animation when stashing transient taskbar." into tm-qpr-dev am: ba85154590 am: 9c0ad5f746 am: 7953f25c3c

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/22178236

Change-Id: I87d8a903e341a4e5046b08d727cdba467bc8277d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>