Merge "Add spring animation when stashing transient taskbar." into tm-qpr-dev am: ba85154590 am: 9c0ad5f746 am: 7953f25c3c am: 80a1bc19ea

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

Change-Id: Ibd93ae9cb7d7e665a20ee1e18329e66d12db7b5e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>