[3.11] gh-89792: Limit test_tools freeze test build parallelism based on the number of cores (GH-101841) #101842
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unhardcode freeze test build parallelism. base it on the number of cpus, don't use more than max(2, os.cpu_count()/3).
(cherry picked from commit dfc2e06)
Co-authored-by: Gregory P. Smith [email protected]