Migrate away for s3://k8s-kops-prow

[ameukam]

/kind feature

1. Describe IN DETAIL the feature/behavior/change you would like to see.

We currently use a hardcode S3 bucket kubetest2-kops. We should instead create dynamic ephemeral buckets only for the execution of the test.
This should help finalize the migration to the community infrastructure.

2. Feel free to provide a design supporting your feature request.

/assign

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/lifecycle stale

[ameukam]

/remove-lifecycle stale