chore(ext/node): run node compat parallel tests in core number concurrency #18505
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We currently run the all test cases in
parallel
category at the same time, which invokes hundreds process at the same time, and that seems causing some flakiness in CI. (maybe related to #18487)This PR limits the concurrency to the number of cpu cores. This is more aligned to how Node.js run their
parallel
test in their repository. https://github.com/nodejs/node/blob/42c4a359525f70c322c0df0eac188fa2b05c3f53/Makefile#L356