[EKS] [request]: Hide extension-apiserver-authentication from users

**Tell us about your request**
To hide the config map resource `extension-apiserver-authentication` from the users.

**Which service(s) is this request for?**
EKS

**Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?**

We bumped into an issue with our EKS cluster trying to manage configmaps created in the cluster and deleted the cm resource `extension-apiserver-authentication` . This config map is created by the api server [Ref](https://github.com/kubernetes-incubator/apiserver-builder-alpha/blob/master/docs/concepts/auth.md#client-certificate-authentication) .

I had opened a case with the EKS team and the issue has been pending for over 4 days now and the issue might be resolved with restarting the api-server of the cluster.

However since we dont have access to do that, it would be very helpful to hide the configmap from the users.

Start with the Kubernetes apiserver-builder authentication reference linked in the issue and investigate how EKS exposes the extension-apiserver-authentication ConfigMap. Done would mean defining and implementing a supported way to hide this control-plane resource from users without disrupting cluster authentication.

Written by the indexing model from the issue text.