Merge "Refresh widgets in the model when packages change" into sc-dev am: 10d4edade1 am: f12eca67b2 am: 9810f61bd0

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

Change-Id: I22d3f094ec467321e3a24effb04cca5f82fbadf0