Review skip Proxy and DNS in KCP and in the KubeadmConfig

[fabriziopandini]

As of today KCP allows to skip reconcile of Proxy and DNS via two annotations (controlplane.cluster.x-k8s.io/skip-kube-proxy and controlplane.cluster.x-k8s.io/skip-coredns)

Some time ago, the v1beta4 version of the kubeadm API introduced the cabability to skip installation of Proxy and DNS, but currently this option is not surfacing in the KubeConfig/KubeadmControlPlane CRD

When we will consider surfacing the new kubeadm option in the KubeConfig/KubeadmControlPlane, we should review this feature in an holistic way, considering possible permutation of skip install and skip reconcile, and possibly focus the implementation on the most relevant for the users

[k8s-ci-robot]

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