Merge "Refresh widgets in the model when packages change" into sc-dev am: 10d4edade1 am: e994b674dd am: 1e314158e9

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

Change-Id: I74e85ce7ca6fdf72f9c19330158f077f61a30873