Removed v1alpha1 ValidatingAdmissionPolicy

Kubernetes v1.32 implicitly removes ValidatingAdmissionPolicy and
ValidatingAdmissionPolicyBinding from admissionregistration.k8s.io/v1alpha
in accordance with APILifecycle policy.

This commit removes the relevant CRDs, informers and APIExport builtin types.

On-behalf-of: SAP [email protected]
Signed-off-by: Robert Vasek <[email protected]>

Author: gman0