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

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

Change-Id: I2cdbfb887c0a1ca758620c790788fad37fa0916c