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

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

Change-Id: Ie8a852ed4ac0d2856a1afc2a33aca3b6905dc9da