kk create config from cluster reports error - kube-proxy not found

I have an existing kubernetes cluster that was not installed by kk:
- k8s version 1.20.4
- cilium 1.9.4 enabled
- no kube-proxy enabled

when I create kk config from it, I got an error like as following:

```bash
root@node0:~# kk create config --from-cluster -f ubtk8s.yaml --kubeconfig ./config
Error: configmaps "kube-proxy" not found
```

Start from the `kk create config --from-cluster` command and trace the handling of the `kube-proxy` ConfigMap reported in the error. Reproduce against a Kubernetes 1.20.4 cluster using Cilium without kube-proxy, then verify that configuration generation completes successfully without requiring that ConfigMap.

Written by the indexing model from the issue text.