Introduce PPC_IMPLEMENTATIONS variable (#593) #3828

Job	Run time
pre-commit / pre-commit	1m 15s
ubuntu / clang-build (ubuntu-24.04)	48s
ubuntu / gcc-build (ubuntu-24.04, Release)	1m 14s
ubuntu / clang-build (ubuntu-24.04-arm)	58s
ubuntu / gcc-build (ubuntu-24.04, Debug)	48s
windows / msvc-build (Debug)	2m 46s
ubuntu / gcc-build (ubuntu-24.04-arm, Release)	53s
mac / clang-build (Debug)	1m 58s
windows / msvc-build (Release)	1m 39s
ubuntu / gcc-build (ubuntu-24.04-arm, Debug)	59s
mac / clang-build (Release)	2m 3s
windows / clang-build	2m 9s
ubuntu / clang-test (ubuntu-24.04-arm)	8m 14s
ubuntu / clang-test (ubuntu-24.04)	8m 26s
ubuntu / clang-sanitizer-build (ubuntu-24.04)	1m 1s
ubuntu / gcc-test (ubuntu-24.04-arm)	8m 14s
ubuntu / gcc-test (ubuntu-24.04)	8m 21s
mac / clang-test	4m 51s
ubuntu / clang-sanitizer-test (ubuntu-24.04)	2m 58s
windows / clang-test	2m 51s
windows / msvc-test	4m 30s
windows / clang-test-extended	3m 1s
ubuntu / clang-sanitizer-test-extended (ubuntu-24.04)	2m 23s
mac / clang-test-extended	2m 56s
windows / msvc-test-extended	2m 57s
ubuntu / clang-test-extended (ubuntu-24.04)	4m 43s
ubuntu / clang-test-extended (ubuntu-24.04-arm)	4m 52s
ubuntu / gcc-test-extended (ubuntu-24.04)	4m 42s
ubuntu / gcc-test-extended (ubuntu-24.04-arm)	4m 26s
ubuntu / gcc-build-codecov	5m 58s
perf / macos-clang-build-perf-stats	1m 50s
perf / ubuntu-gcc-build-perf-stats	1m 34s
pages / build-doxygen-xml	1m 20s
pages / build-scoreboard	20s
pages / build-sphinx	37s
pages / deploy-pages	12s
	1h 48m 47s

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