drop providerless job from 1.31, 1.31.0 will not contain the provider…

[BenTheElder]

…less tag

I was working on #18789, found this job with --stage that shouldn't even exist.

second commit disables the forking on the 1.30 job so it won't happen again. https://github.com/kubernetes/test-infra/pull/32586/files#r1710427495

cc @dims xref #32586

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[ameukam]

/lgtm

[k8s-ci-robot]

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

• key 1.30.yaml using file config/jobs/kubernetes/sig-release/release-branch-jobs/1.30.yaml
• key 1.31.yaml using file config/jobs/kubernetes/sig-release/release-branch-jobs/1.31.yaml

In response to this:

…less tag

I was working on #18789, found this job with --stage that shouldn't even exist.

second commit disables the forking on the 1.30 job so it won't happen again. https://github.com/kubernetes/test-infra/pull/32586/files#r1710427495

cc @dims xref #32586

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