kyaml: mark ValidatingAdmissionPolicy resources as cluster-scoped

[HarshithaMS005]

Fixes #6051.

ValidatingAdmissionPolicy and ValidatingAdmissionPolicyBinding are cluster-scoped resources, but were missing from kyaml’s precomputed namespace scope map. As a result, NamespaceTransformer incorrectly injected metadata.namespace when a namespace was set in the kustomisation. This PR marks both resources as cluster-scoped and adds a regression test to ensure namespaces are not added to these admission registration APIs.

[linux-foundation-easycla]

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