Delete old git-custom-k8s-auth image push job.

[michelle192837]

No references remain to this job
(https://cs.k8s.io/?q=gcr.io%2Fk8s-prow%2Fgit-custom-k8s-auth&i=nope&files=&excludeFiles=&repos=), and the new job is pushing images to k8s-staging-test-infra (https://testgrid.k8s.io/sig-testing-image-pushes#git-custom-k8s-auth), so this should be fine to delete.

Ref #32432

(Okay take 2, using the updated job list 😅 )

[BenTheElder]

/lgtm
/approve
thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BenTheElder, michelle192837

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[k8s-ci-robot]

@michelle192837: Updated the job-config configmap in namespace default at cluster test-infra-trusted using the following files:

• key test-infra-trusted.yaml using file config/jobs/kubernetes/test-infra/test-infra-trusted.yaml

In response to this:

No references remain to this job
(https://cs.k8s.io/?q=gcr.io%2Fk8s-prow%2Fgit-custom-k8s-auth&i=nope&files=&excludeFiles=&repos=), and the new job is pushing images to k8s-staging-test-infra (https://testgrid.k8s.io/sig-testing-image-pushes#git-custom-k8s-auth), so this should be fine to delete.

Ref #32432

(Okay take 2, using the updated job list 😅 )

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