Remove CustomResourceValidationExpressions from alpha test

[cici37]

The feature has been promoted to beta in kubernetes/kubernetes#111524

[cici37]

@andrewsykim @cheftako Would any of you have time to take a look at this one? Thank you

[cheftako]

This relies on kubernetes/kubernetes#111448 to get the beta testing to occur.

[cheftako]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cheftako, cici37

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[k8s-ci-robot]

@cici37: Updated the job-config configmap in namespace default at cluster test-infra-trusted using the following files:

• key gcp-gce.yaml using file config/jobs/kubernetes/sig-cloud-provider/gcp/gcp-gce.yaml

In response to this:

The feature has been promoted to beta in kubernetes/kubernetes#111524

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