stop building full release in e2e-windows-gce

[BenTheElder]

fixes #18943
This is still going to be a bit slow and more expensive / build heavy than I'd like to be running in presubmit, but it's far cheaper than doing a full release build.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[BenTheElder]

/retest

[jeremyje]

/lgtm
/approval

[k8s-ci-robot]

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

• key windows-gce.yaml using file config/jobs/kubernetes/sig-windows/windows-gce.yaml

In response to this:

fixes #18943
This is still going to be a bit slow and more expensive / build heavy than I'd like to be running in presubmit, but it's far cheaper than doing a full release build.

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