Merge "Refresh widgets in the model when packages change" into sc-dev am: 10d4edade1 am: f12eca67b2

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

Change-Id: Ia522a18223b5cb20c508d04dfee62547118c9d83