Add GetNumProc utility #3493

Job	Run time
lint / clang-format	10s
lint / python-lint	6s
lint / shell-lint	14s
ubuntu / gcc-build (ubuntu-24.04, Release)	1m 54s
ubuntu / clang-build (ubuntu-24.04)	3m 3s
ubuntu / clang-build (ubuntu-24.04-arm)	2m 9s
ubuntu / gcc-build (ubuntu-24.04-arm, Debug)	1m 54s
ubuntu / gcc-build (ubuntu-24.04-arm, Release)	1m 49s
ubuntu / gcc-build (ubuntu-24.04, Debug)	1m 59s
windows / clang-build	7m 46s
mac / clang-build (Debug)	2m 8s
mac / clang-build (Release)	2m 8s
windows / msvc-build (Debug)	5m 29s
windows / msvc-build (Release)	3m 5s
ubuntu / gcc-test (ubuntu-24.04-arm)	8m 36s
ubuntu / gcc-test (ubuntu-24.04)	9m 42s
ubuntu / clang-test (ubuntu-24.04)	9m 59s
ubuntu / clang-sanitizer-build (ubuntu-24.04)	3m 24s
ubuntu / clang-test (ubuntu-24.04-arm)	9m 32s
mac / clang-test	5m 2s
windows / msvc-test	4m 54s
windows / clang-test	3m 32s
mac / clang-test-extended	3m 2s
ubuntu / clang-sanitizer-test (ubuntu-24.04)	4m 16s
ubuntu / gcc-test-extended (ubuntu-24.04)	5m 20s
ubuntu / gcc-test-extended (ubuntu-24.04-arm)	5m 8s
windows / clang-test-extended	3m 0s
windows / msvc-test-extended	2m 56s
ubuntu / clang-test-extended (ubuntu-24.04-arm)	5m 23s
ubuntu / clang-test-extended (ubuntu-24.04)	6m 11s
ubuntu / clang-sanitizer-test-extended (ubuntu-24.04)	2m 48s
ubuntu / gcc-build-codecov	7m 37s
perf / ubuntu-gcc-build-perf-stats	2m 49s
pages / build-doxygen-xml	1m 18s
pages / build-scoreboard	16s
pages / build-sphinx	44s
pages / deploy-pages	0s
	2h 19m 23s

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