Dataset authentication for Augmented Autofill

Setting an authentication IntentSender on an Augmented Autofill
suggestion was being ignored. With this change, it will trigger
the auth flow as documented.

Fix: 157863999
Test: Manual
Test: atest android.autofillservice.cts.inline
Change-Id: Id21c8f074bd0f49992e01445d50b1503af4720b6