Merge "Remove TaskbarLauncherStateController#setIconAlpha()" into sc-v2-dev am: 3d2a1a7368 am: a14fd14c65

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/16374169

Change-Id: Id60002f4dc45aff2c6a721ae0c8a480d32a228e4