remove unmigrated scalability presubmits

[BenTheElder]

Refer to #33226 and #33128

Will remove the legacy GCP janitor jobs in a follow-up, there's a couple other CI jobs remaining with legacy GCP references anyhow, and we want to be sure there are no recent runs since the last janitor run first.

[BenTheElder]

I'm also punting the docs/job-migration-todo.md & presubmit test updates to avoid rebase hell, will roll those up after the other PRs.

[ameukam]

FYI @kubernetes/sig-scalability-leads

/lgtm
/hold

Remove the hold when ready.

[BenTheElder]

/hold cancel

We have options to re-introduce these on community resources if desired, see #33128 (comment)

[upodroid]

LGTM

[dims]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BenTheElder, dims, upodroid

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[k8s-ci-robot]

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

• key sig-scalability-presubmit-jobs.yaml using file config/jobs/kubernetes/sig-scalability/sig-scalability-presubmit-jobs.yaml

In response to this:

Refer to #33226 and #33128

Will remove the legacy GCP janitor jobs in a follow-up, there's a couple other CI jobs remaining with legacy GCP references anyhow, and we want to be sure there are no recent runs since the last janitor run first.

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[BenTheElder]

We actually have no recorded runs of these, so we should be good to remove the janitors after removing the other remaining jobs that reference external GCP resources #33231