Remove old TestGrid config upload job.

[michelle192837]

The new upload job (post-test-infra-upload-testgrid-config-canary, https://testgrid.k8s.io/sig-testing-maintenance#testgrid-config-update-canary) is working and TestGrid's config-merger is successfully pulling it in canary, so the old one shouldn't be needed anymore.

/hold

I want to let this soak for a bit in the production config-merger (until I verify it works a couple times).

Ref #32432

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[ameukam]

/lgtm

[michelle192837]

Config merging has succeeded in prod! Let's see how it goes...

/hold cancel

[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:

The new upload job (post-test-infra-upload-testgrid-config-canary, https://testgrid.k8s.io/sig-testing-maintenance#testgrid-config-update-canary) is working and TestGrid's config-merger is successfully pulling it in canary, so the old one shouldn't be needed anymore.

/hold

I want to let this soak for a bit in the production config-merger (until I verify it works a couple times).

Ref #32432

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