this feature gate was meant to be ephemeral, and only was used for guaranteeing a
cluster admin didn't accidentally relax PSA policies before the kubelet would deny a pod
was created if it didn't support user namespaces. As of kube 1.33, the supported apiserver version
skew of n-3 guarantees that all supported kubelets are of 1.30 or later, meaning they do this.
Now, we can unconditionally relax PSA policy if a pod is in a user namespace.
This PR reserves older policies default behavior by never relaxing
Signed-off-by: Peter Hunt <pehunt@redhat.com>