Revert "sig-testing: uses LABEL_FILTER instead of FOCUS"

[BenTheElder]

This reverts commit 6f35659.

We need to test changes like this before rolling them out to presubmit and when merging major changes to presubmit we need to verify that they're working as intended following the merge.

I'm pretty sure this is the root cause for kubernetes/kubernetes#126401

[k8s-ci-robot]

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[dims]

/priority critical-urgent

[dims]

/kind failing-test

[dims]

cc @carlory @pacoxu

[k8s-ci-robot]

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

• key kubernetes-kind.yaml using file config/jobs/kubernetes/sig-testing/kubernetes-kind.yaml

In response to this:

This reverts commit 6f35659.

We need to test changes like this before rolling them out to presubmit and when merging major changes to presubmit we need to verify that they're working as intended following the merge.

I'm pretty sure this is the root cause for kubernetes/kubernetes#126401

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[BenTheElder]

we'll see in https://prow.k8s.io/view/gs/kubernetes-jenkins/pr-logs/pull/126345/pull-kubernetes-e2e-kind/1816987117226561536

It will take a bit to know because building Kubernetes takes a 5-10m easily, will check back shortly

[BenTheElder]

We appear to be running tests now.