Fix AutofillManager and Session status not sync with fill dialog

AutofillManager only allow show fill dialog once, but Autofill Session
is not. Make Session diabled after shown fill dialog.

Bug: 230526485
Test: atest android.autofillservice.cts.dialog.LoginActivityTest
Test: Manual - click two fields that supported fill dialog.
      Result - second field does not show fill dialog.
Change-Id: I1145c3b44058143b6751c27f1e5619d7a4ebea58