Starting with GKE version 1.36, the default engine for kube-dns is CoreDNS

## Issue Issue Starting with GKE version 1.36, the default engine for kube-dns is [CoreDNS](https://coredns.io/). For Pod IP DNS queries in the `<a-b-c-d>.<namespace>.pod.cluster.local` format, CoreDNS returns NXDOMAIN if the specified `<namespace>` does not exist. The legacy `kubernetes/dns` implementation skipped checking the existence of the namespace provided in the `<namespace>` segment in these queries. Queries in the `<a-b-c-d>.<namespace>.pod.cluster.local` format are not part of the[Kubernetes DNS specification](https://github.com/kubernetes/dns/blob/master/docs/specification.md). We can't guarantee that uses outside of those specified in the DNS spec will remain consistent across releases. Mitigation: * **Recommended**: Migrate to supported headless Service DNS records (`<hostname>.<subdomain>.<namespace>.svc.cluster.local`). * **Workaround**: Ensure the `<namespace>` specified in the DNS query exists in the cluster.