Verify CoreDNS v1.8.1 dual stack changes via brief CI test

We need to verify that no new CoreDNS dual stack features require any configuration changes or feature flags.
(All dual stack changes should just work once we rebase to coredns v1.8.1).

See https://github.com/coredns/coredns/pull/4339 .

We also need to verify that cluster DNS works for both v4 and v6 for a dual stack cluster IP service. (ie request via A and AAAA, make sure you get the desired response, and not just one or the other). A brief CI test on our dual stack metal CI might make the most sense here (KNI Might have a job like this already, need to investigate our options to add dual stack coverage to openshift/coredns).