Add LLVM-based coverage generation support #3782

Job	Run time
pre-commit / pre-commit	1m 7s
windows / clang-build	3m 39s
windows / msvc-build (Debug)	3m 20s
windows / msvc-build (Release)	3m 26s
mac / clang-build (Release)	2m 45s
mac / clang-build (Debug)	1m 50s
ubuntu / clang-build (ubuntu-24.04)	56s
ubuntu / clang-build (ubuntu-24.04-arm)	1m 5s
ubuntu / gcc-build (ubuntu-24.04, Release)	58s
ubuntu / gcc-build (ubuntu-24.04-arm, Debug)	1m 9s
ubuntu / clang-build-codecov	1m 21s
ubuntu / gcc-build (ubuntu-24.04-arm, Release)	1m 15s
ubuntu / gcc-build (ubuntu-24.04, Debug)	59s
ubuntu / clang-test (ubuntu-24.04-arm)	4m 56s
ubuntu / clang-sanitizer-build (ubuntu-24.04)	2m 52s
ubuntu / clang-test (ubuntu-24.04)	4m 59s
ubuntu / gcc-test (ubuntu-24.04-arm)	4m 46s
ubuntu / gcc-test (ubuntu-24.04)	4m 46s
mac / clang-test	3m 22s
windows / msvc-test	2m 56s
windows / clang-test	2m 45s
ubuntu / clang-sanitizer-test (ubuntu-24.04)	2m 7s
ubuntu / clang-test-extended	1s
ubuntu / gcc-test-extended	1s
ubuntu / clang-sanitizer-test-extended	1s
mac / clang-test-extended	1s
windows / msvc-test-extended	1s
windows / clang-test-extended	1s
perf	0s
pages	0s
	57m 25s

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