[Hypershift] hosted clusters default KAS PSA config should be consistent with OCP

[Hypershift] default KAS PSA config should be consistent with OCP 
 enforce: privileged 

4.13.0-0.nightly-2023-04-21-084440

Always

1. Install OCP cluster and hypershift operator
2. Create hosted cluster
3. Check the default KAS config of the hosted cluster

The hosted cluster default KAS PSA config enforce is 'restricted'
$ jq '.admission.pluginConfig.PodSecurity' < `oc extract cm/kas-config -n clusters-9cb7724d8bdd0c16a113 --confirm`
{
  "location": "",
  "configuration": {
    "kind": "PodSecurityConfiguration",
    "apiVersion": "pod-security.admission.config.k8s.io/v1beta1",
    "defaults": {
      "enforce": "restricted",
      "enforce-version": "latest",
      "audit": "restricted",
      "audit-version": "latest",
      "warn": "restricted",
      "warn-version": "latest"
    },
    "exemptions": {
      "usernames": [
        "system:serviceaccount:openshift-infra:build-controller"
      ]
    }
  }
}

The hosted cluster default KAS PSA config enforce should be 'privileged' in

https://github.com/openshift/hypershift/blob/release-4.13/control-plane-operator/controllers/hostedcontrolplane/kas/config.go#L93