Merge "Remove widget panel" into sc-v2-dev am: dc57b06e29 am: 6c0bd21c4e

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15547451

Change-Id: If266743bc02e6367d881f5b85c9ef873b6bba324