k8s: return error if nil CNP is provided to `updateStatusWithCapabilities`
k8s: return error if nil CNP is provided to `updateStatusWithCapabilities`

Signed-off by: Ian Vernon <ian@cilium.io>

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