Drop the usage of kube-rbac-proxy

[afritzler]

Summary

Starting early 2025 the support for kube-rbac-proxy will be discontinued in favor of the usage of authn/authz. We need to remove the usage of kube-rbac-proxy from this project and replace it accordingly following the community provided guide: https://github.com/kubernetes-sigs/kubebuilder/blob/master/docs/book/src/reference/metrics.md#important-if-you-are-using-kube-rbac-proxy