Merge "Add accessibility announcement when user clicks on 'Add automatically to home screen' button" into sc-dev am: 972ab9327c am: 93d4d0dc61 am: 4ca886a9e5

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15242979

Change-Id: I137509e59eeaab3b48909566d43da11a0c7ae78c