Merge "Add a11y action for expand / collapse items in WidgetsFullSheet" into sc-dev am: f4bd91f0ab am: e523e3f65c

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14314645

Change-Id: I7daac110bc45947d975e9cc5d862cf6ec3566369