Add GetNumProc util helper (#533) #3506

Job	Run time
lint / clang-format	11s
lint / python-lint	5s
lint / shell-lint	14s
mac / clang-build (Debug)	2m 3s
mac / clang-build (Release)	2m 15s
ubuntu / clang-build (ubuntu-24.04-arm)	2m 5s
ubuntu / gcc-build (ubuntu-24.04, Release)	3m 4s
ubuntu / clang-build (ubuntu-24.04)	2m 20s
windows / msvc-build (Debug)	5m 41s
ubuntu / gcc-build (ubuntu-24.04-arm, Release)	1m 29s
windows / msvc-build (Release)	3m 37s
ubuntu / gcc-build (ubuntu-24.04, Debug)	3m 9s
windows / clang-build	2m 52s
ubuntu / gcc-build (ubuntu-24.04-arm, Debug)	2m 1s
mac / clang-test	4m 59s
ubuntu / clang-test (ubuntu-24.04)	8m 45s
ubuntu / clang-test (ubuntu-24.04-arm)	9m 7s
ubuntu / clang-sanitizer-build (ubuntu-24.04)	3m 27s
windows / clang-test	2m 44s
ubuntu / gcc-test (ubuntu-24.04)	8m 34s
ubuntu / gcc-test (ubuntu-24.04-arm)	8m 46s
windows / clang-test-extended	2m 44s
windows / msvc-test	4m 34s
ubuntu / clang-sanitizer-test (ubuntu-24.04)	4m 10s
mac / clang-test-extended	2m 59s
ubuntu / clang-sanitizer-test-extended (ubuntu-24.04)	3m 32s
windows / msvc-test-extended	3m 0s
ubuntu / clang-test-extended (ubuntu-24.04-arm)	5m 9s
ubuntu / clang-test-extended (ubuntu-24.04)	5m 41s
ubuntu / gcc-test-extended (ubuntu-24.04-arm)	4m 47s
ubuntu / gcc-test-extended (ubuntu-24.04)	4m 54s
ubuntu / gcc-build-codecov	7m 16s
perf / ubuntu-gcc-build-perf-stats	2m 33s
pages / build-scoreboard	13s
pages / build-doxygen-xml	17s
pages / build-sphinx	2m 3s
pages / deploy-pages	12s
	2h 11m 32s

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