Introduce PPC_IMPLEMENTATIONS variable (#593) #3825

Job	Run time
pre-commit / pre-commit	1m 8s
ubuntu / clang-build (ubuntu-24.04-arm)	58s
ubuntu / gcc-build (ubuntu-24.04, Debug)	48s
mac / clang-build (Debug)	1m 59s
ubuntu / gcc-build (ubuntu-24.04-arm, Debug)	1m 15s
windows / msvc-build (Release)	1m 39s
ubuntu / gcc-build (ubuntu-24.04, Release)	46s
ubuntu / gcc-build (ubuntu-24.04-arm, Release)	1m 14s
windows / clang-build	2m 13s
mac / clang-build (Release)	1m 54s
windows / msvc-build (Debug)	2m 34s
ubuntu / clang-build (ubuntu-24.04)	58s
ubuntu / clang-test (ubuntu-24.04-arm)	8m 43s
ubuntu / clang-test (ubuntu-24.04)	8m 21s
ubuntu / clang-sanitizer-build (ubuntu-24.04)	50s
ubuntu / gcc-test (ubuntu-24.04)	8m 20s
ubuntu / gcc-test (ubuntu-24.04-arm)	8m 14s
ubuntu / clang-sanitizer-test (ubuntu-24.04)	3m 7s
mac / clang-test	5m 1s
windows / clang-test	2m 54s
windows / msvc-test	4m 52s
ubuntu / clang-sanitizer-test-extended (ubuntu-24.04)	2m 26s
windows / clang-test-extended	3m 1s
mac / clang-test-extended	3m 11s
windows / msvc-test-extended	3m 11s
ubuntu / gcc-test-extended (ubuntu-24.04-arm)	4m 38s
ubuntu / gcc-test-extended (ubuntu-24.04)	4m 32s
ubuntu / clang-test-extended (ubuntu-24.04)	4m 35s
ubuntu / clang-test-extended (ubuntu-24.04-arm)	4m 24s
ubuntu / gcc-build-codecov	6m 1s
perf / macos-clang-build-perf-stats	1m 55s
perf / ubuntu-gcc-build-perf-stats	1m 35s
pages / build-scoreboard	13s
pages / build-doxygen-xml	1m 36s
pages / build-sphinx	1m 36s
pages / deploy-pages	0s
	1h 50m 42s

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