rename cluster used

[volatilemolotov]

Change to new name for kafka cluster as done in #30847

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[volatilemolotov]

@damccorm This can be merged as the cluster referenced is already deployed

[volatilemolotov]

@damccorm Also when you merge can you trigger the https://github.com/apache/beam/actions/workflows/beam_StressTests_Java_KafkaIO.yml
so we can verify

[damccorm]

Running - https://github.com/apache/beam/actions/runs/8879975636