Add LLVM-based coverage generation support #3778

Job	Run time
pre-commit / pre-commit	1m 9s
ubuntu / clang-build-codecov	2m 26s
ubuntu / clang-build (ubuntu-24.04)	1m 9s
mac / clang-build (Debug)	2m 16s
ubuntu / gcc-build (ubuntu-24.04-arm, Debug)	1m 27s
ubuntu / clang-build (ubuntu-24.04-arm)	1m 21s
mac / clang-build (Release)	2m 30s
ubuntu / gcc-build (ubuntu-24.04, Release)	58s
ubuntu / gcc-build (ubuntu-24.04-arm, Release)	1m 25s
ubuntu / gcc-build (ubuntu-24.04, Debug)	49s
windows / msvc-build (Release)	2m 35s
windows / msvc-build (Debug)	3m 0s
windows / clang-build	1m 50s
ubuntu / clang-test (ubuntu-24.04-arm)	8m 26s
ubuntu / clang-test (ubuntu-24.04)	8m 37s
ubuntu / clang-sanitizer-build (ubuntu-24.04)	54s
windows / clang-test	3m 36s
ubuntu / gcc-test (ubuntu-24.04-arm)	8m 25s
ubuntu / gcc-test (ubuntu-24.04)	8m 24s
ubuntu / clang-sanitizer-test (ubuntu-24.04)	2m 52s
mac / clang-test	4m 55s
windows / msvc-test	5m 57s
ubuntu / clang-sanitizer-test-extended (ubuntu-24.04)	2m 39s
windows / clang-test-extended	6m 42s
mac / clang-test-extended	2m 55s
windows / msvc-test-extended	3m 55s
ubuntu / clang-test-extended (ubuntu-24.04)	4m 31s
ubuntu / clang-test-extended (ubuntu-24.04-arm)	4m 39s
ubuntu / gcc-test-extended (ubuntu-24.04)	4m 31s
ubuntu / gcc-test-extended (ubuntu-24.04-arm)	4m 52s
pages	0s
perf	0s
	1h 49m 45s

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