Suppress fill and save dialog for activities that have credman field.

Bug:261048555
Test: atest tests/autofillservice/src/android/autofillservice/cts/saveui/AutofillSaveDialogTest.java#testSuppressingSaveDialogOnActivityThatOnlyHasCredmanField

      atest tests/autofillservice/src/android/autofillservice/cts/dialog/LoginActivityTest.java#testSuppressingFillDialogOnActivityThatOnlyHasCredmanField

Change-Id: I18587ef3697a071f690a0f1662f8d5c12aeb58b5
(cherry picked from commit f19d8217)