policyengine/PolicyDispatcher: allow to delete unprivileged policy

[kfirtoledo]

Add delete unprivileged policy function,
(Delete privileged policy is still missing -can be done by adding finalizer before deleting to the policies or separate access policy CRDS to privileged and non-privileged)

[elevran]

This seems like an intermediate step towards deleting policies, which still tries to maintain backward compatibility.
Is it really worthwhile, or should we move directly to full CRD instance (allowing duplicate names across namespaces, same name for privileged and normal in the same namespace, etc.)?
Am ok approving if the next iteration of the change is already in the works and you're just breaking up the larger change into smaller changesets.
Also, not the test failure...

[elevran]

for now, we'll support a single level of policies