Merge "Remove widget panel related leftover workspace items" into sc-v2-dev am: 69fd5cb959 am: 29ad430f36

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15763353

Change-Id: Ice35fd5a9ca28916a33059ff776ff06db9acef02