Merge "Delete TaskbarStateHander" into sc-v2-dev am: c6bdd9243a am: 6b9f78e34a

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/16124697

Change-Id: I2b90d34e7d6ac375c67810784999969d4973a385