Remove AuthDialog and AuthDialogCallback Reasons

* Removes AuthDialog interface which is only use by AuthContainerView.
* Removes AuthDialogCallback.DismissedReason which are duplicates of similiar
BiometricPrompt.DismissedReasons

Test: atest AuthControllerTest
Test: atest AuthContainerViewTest
Bug: 391644182
Flag: EXEMPT small cleanup

Change-Id: Ia684f0fa3f9451424a45692287c57cf12fc804fe