test_auto_scaling is flaky

It looks like test_auto_scaling can sometimes fail to reach the required query throughput within the configured timeout.

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Error MessageAssertionError: Query rate did not surpass 5 within 45 s assert any(<generator object <genexpr> at 0x7f7ad65856e0>)Stacktracecustom_cluster/test_auto_scaling.py:104: in test_single_workload
assert any(workload.get_query_rate() > min_query_rate or sleep(1)
E AssertionError: Query rate did not surpass 5 within 45 s
E assert any(<generator object <genexpr> at 0x7f7ad65856e0>)
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