Fix load test dataproc cluster name exceeded allowed length

[Abacn]

Fix https://github.com/apache/beam/actions/workflows/beam_LoadTests_Python_ParDo_Flink_Streaming.yml

This is a funny one. when github.run_id incremented from 9995517471 -> 10011544246, gcloud.dataproc.clusters.create fails with cluster name too long

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[Abacn]

after fix, it's running: https://github.com/apache/beam/actions/runs/10217518140

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[chamikaramj]

LGTM