Merge "Refresh widgets in the model when packages change" into sc-dev am: 10d4edade1 am: ab605f3194

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15012535

Change-Id: I7686da3e8444636a9313768a32c3e749592344e6