RFR: 7903915: JMH: Rebalance tests and test jobs parallelism [v2]

[Aleksey 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.

Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:

  Remove redundant change

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Changes:
  - all: https://git.openjdk.org/jmh/pull/151/files
  - new: https://git.openjdk.org/jmh/pull/151/files/7c8f48bb..5b3f8747

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jmh&pr=151&range=01
 - incr: https://webrevs.openjdk.org/?repo=jmh&pr=151&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jmh/pull/151.diff
  Fetch: git fetch https://git.openjdk.org/jmh.git pull/151/head:pull/151

PR: https://git.openjdk.org/jmh/pull/151