k8s: Restore removed CiliumNode CRD validation
k8s: Restore removed CiliumNode CRD validation

This was accidently removed in commit
225526078b05c0b8d7d37d91cae8a62d45c0a448.

Fixes: 2255260 ("k8s, policy: Add automated CRD generation")

Signed-off-by: Chris Tarazi <711c73f64afdce07b7e38039a96d2224209e9a6c@isovalent.com>

cilium-team/cilium,tklauser/cilium,tklauser/cilium,michi-covalent/cilium,cilium/cilium,cilium-team/cilium,cilium/cilium,cilium/cilium,tgraf/cilium,tklauser/cilium,michi-covalent/cilium,tklauser/cilium,tgraf/cilium,tgraf/cilium,tklauser/cilium,michi-covalent/cilium,cilium/cilium,tgraf/cilium,tgraf/cilium,tgraf/cilium,michi-covalent/cilium,cilium/cilium,michi-covalent/cilium