borrow pull-kubernetes-e2e-gce-cos-alpha-features job for ValidatingAdmissionPolicy.

[jiahuif]

This PR adds ValidatingAdmissionPolicy to the list of features being tested in job pull-kubernetes-e2e-gce-cos-alpha-features and ci-kubernetes-e2e-gci-gce-alpha-features.

will remove after beta graduation.

Actual tests here kubernetes/kubernetes#114514

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: jiahuif
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[jiahuif]

/assign @cheftako @andrewsykim
Could you take a look when available? Thank you.

[jiahuif]

/cc @cici37

[jiahuif]

/close
in favor of #29599

[k8s-ci-robot]

@jiahuif: Closed this PR.

In response to this:

/close
in favor of 29599

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