Update tests config 1.34

[mbianchidev]

Updating test configuration to add support for the upcoming 1.34 release, promote existing versions, and deprecate (comment out) the oldest supported version (stable4) which is currently 1.30 (EOL).

[k8s-ci-robot]

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[k8s-ci-robot]

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[mbianchidev]

/hold until #35272 merges and its prowjob succeeds - the missing tag is generated by that job

Substitute kubekins-e2e:v20250807-xxxxxxxx-1.34 with the actual tag

[drewhagen]

/hold until #35272 merges and its prowjob succeeds - the missing tag is generated by that job. Substitute kubekins-e2e:v20250807-xxxxxxxx-1.34 with the actual tag

Tag appears to be gcr.io/k8s-staging-test-infra/kubekins-e2e:v20250807-7b202b3ee9-1.34

pulled from 1.34 log: https://storage.googleapis.com/kubernetes-ci-logs/logs/post-test-infra-push-kubekins-e2e-v2/1953288986747211776/artifacts/1.34.log

I didn't have permissions to update this draft PR so I opened a new one:
#35275

[mbianchidev]

Keeping this open until the other PR merges, then closing