Show an 'Undo' snackbar when users dismiss a predicted hotseat item. am: 510a8185

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/17509020



Change-Id: I2f3b7b8e778ace8d280f2d4982416d2677d36968
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>