[Backport to v2.2.0 release branch] Soak tests on Kubernetes (#1821)

[emasab]

soak tests can now run on k8s with different test ids corresponding to different clusters

What

Checklist

• [ ] Contains customer facing changes? Including API/behavior changes
• [ ] Did you add sufficient unit test and/or integration test coverage for this PR?
  • If not, please explain why it is not required

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JIRA:

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[confluent-cla-assistant[bot]]

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