[release-v1.38] Auto pick #3866: Set explicit DNS nameservers for calico/node when needed

[caseydavenport]

Cherry pick of #3866 on release-v1.38.

#3866: Set explicit DNS nameservers for calico/node when needed

Original PR Body below

Description

In eBPF mode (and theoretically any time KUBERNETES_SERVICE_HOST is a domain name instead of an IP), calico/node needs explicit nameserver configuration in order to resolve the address. Inherit this from the operator pod's configuration itself.

This is needed as a consequence of adjusting the DNS policy on calico/node to ClusterFirstWithHostNet, which was done as part of enabling DNS resolution of goldmane running as an in-cluster service.

For PR author

• Tests for change.
• If changing pkg/apis/, run make gen-files
• If changing versions, run make gen-versions

For PR reviewers

A note for code reviewers - all pull requests must have the following:

• Milestone set according to targeted release.
• Appropriate labels:
  • kind/bug if this is a bugfix.
  • kind/enhancement if this is a a new feature.
  • enterprise if this PR applies to Calico Enterprise only.