Kubeadmin user deletion not working for Hypershift hosted cluster

Description of problem:  

Attempts to delete the Kubeadmin user and associated secrets in a Hypershift cluster fail. The user and secret are automatically recreated with new credentials. This prevents compliance with customer security policies that mandate the Kubeadmin user's removal.

Version-Release number of selected component (if applicable):

4.16.0-0.nightly-2024-04-14-063437

How reproducible:

Always

Steps to Reproduce:
1. Identify Hosted Cluster:

# HOSTED_CLUSTER_NAME=$(oc get hostedclusters -n clusters -o jsonpath='{.items[0].metadata.name}')
# echo $HOSTED_CLUSTER_NAME
hypershift-ci-276698

2. Retrieve the kubeadmin secret:

# oc get secret/kubeadmin-password -n "clusters-${HOSTED_CLUSTER_NAME}"
NAME                 TYPE     DATA   AGE
kubeadmin-password   Opaque   1      11m

3. Attempt to delete the kubeadmin secret:

# oc delete secret/kubeadmin-password -n "clusters-${HOSTED_CLUSTER_NAME}"
secret "kubeadmin-password" deleted

4. Re-check for the existence of the kubeadmin secret:

# oc get secret/kubeadmin-password -n "clusters-${HOSTED_CLUSTER_NAME}"
NAME                 TYPE     DATA   AGE
kubeadmin-password   Opaque   1      3s 

Actual results:

The `kubeadmin-password` secret and the Kubeadmin user are recreated within a short period of time,  with new credentials.

Expected results:
The Kubeadmin user should be permanently removed from the cluster.

Additional Notes:
This behavior violates customer security requirements.