7903915: JMH: Rebalance tests and test jobs parallelism

[shipilev]

The ongoing headache with some of the integration tests: some of them effectively test performance, so executing them in parallel introduces flaky failures. We can turn some of those tests serial, but then the testing time would explode on smaller machines, like we have in GHA. We can fix that by rebalancing our GHA test jobs.

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• CODETOOLS-7903915: JMH: Rebalance tests and test jobs parallelism (Enhancement - P4)

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