Merge "Adds AllSetActivity in Launcher." into sc-dev am: 19a1c4765f am: 4bad94b86d am: e27dd36c1d

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14419322

Change-Id: I12c97ac5701e080343ab32d958058b859f17b63d