DO NOT MERGE Use spring-y progress in back to home animation. am: f31bf4e1e3

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/20123116

Change-Id: I926c3b4e4f20a740c29337459228859018bc5e1b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>