Add LLVM-based coverage generation support #3781

Job	Run time
pre-commit / pre-commit	1m 44s
ubuntu / clang-build-codecov	1m 39s
mac / clang-build (Release)	2m 35s
mac / clang-build (Debug)	3m 13s
ubuntu / gcc-build (ubuntu-24.04, Debug)	1m 16s
ubuntu / clang-build (ubuntu-24.04)	2m 8s
ubuntu / clang-build (ubuntu-24.04-arm)	1m 17s
ubuntu / gcc-build (ubuntu-24.04-arm, Debug)	1m 20s
ubuntu / gcc-build (ubuntu-24.04-arm, Release)	1m 15s
ubuntu / gcc-build (ubuntu-24.04, Release)	53s
windows / clang-build	4m 39s
windows / msvc-build (Debug)	4m 13s
windows / msvc-build (Release)	2m 37s
ubuntu / gcc-test (ubuntu-24.04)	8m 25s
ubuntu / gcc-test (ubuntu-24.04-arm)	8m 48s
ubuntu / clang-test (ubuntu-24.04)	8m 34s
ubuntu / clang-sanitizer-build (ubuntu-24.04)	1m 6s
ubuntu / clang-test (ubuntu-24.04-arm)	8m 41s
mac / clang-test	5m 18s
ubuntu / clang-sanitizer-test (ubuntu-24.04)	3m 4s
windows / msvc-test	7m 32s
windows / clang-test	3m 4s
ubuntu / clang-sanitizer-test-extended (ubuntu-24.04)	2m 41s
windows / clang-test-extended	3m 39s
mac / clang-test-extended	3m 24s
ubuntu / gcc-test-extended (ubuntu-24.04)	4m 32s
ubuntu / gcc-test-extended (ubuntu-24.04-arm)	4m 31s
ubuntu / clang-test-extended (ubuntu-24.04)	4m 40s
ubuntu / clang-test-extended (ubuntu-24.04-arm)	4m 48s
windows / msvc-test-extended	3m 1s
perf / ubuntu-gcc-build-perf-stats	1m 40s
perf / macos-clang-build-perf-stats	2m 37s
pages / build-doxygen-xml	1m 23s
pages / build-scoreboard	11s
pages / build-sphinx	2m 5s
pages / deploy-pages	0s
	2h 2m 33s

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