remove legacy prow cluster configuration

[BenTheElder]

this was used by the google operated prow cluster, current config is in github.com/kubernetes/k8s.io

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In response to this:

this was used by the google operated prow cluster, current config is in github.com/kubernetes/k8s.io

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[BenTheElder]

Actually, we might still need this one?

[michelle192837]

I think this is fine, but there are references to it in Prow documentation unfortunately (https://github.com/search?q=repo%3Akubernetes-sigs%2Fprow+test-infra%2Fblob%2Fmaster%2Fconfig%2Fprow%2Fcluster&type=code).

I don't think that needs to block this but we should follow up with a doc update. (Might be a good help-wanted or first issue? 🤔 )

/hold

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[BenTheElder]

Oh, yeah.

I mean these are definitely out of date, if we want to point at Kubernetes's we can point at the files in github.com/kubernetes/k8s.io

I wonder if we should be pointing at the starter copies in the prow repo though.

cc @petr-muller -- FYI

[ameukam]

+1 for removing the terraform code.

For the rest, not tombstone files? are we not breaking downstream ?

[BenTheElder]

I mean we should update the docs, but these are defunct, they haven't been updated in ages.

starter configs were already migrated IIRC