Add LLVM-based coverage generation support #3777

Job	Run time
pre-commit / pre-commit	1m 6s
windows / clang-build	2m 8s
windows / msvc-build (Release)	2m 16s
windows / msvc-build (Debug)	3m 15s
mac / clang-build (Debug)	1m 45s
mac / clang-build (Release)	1m 49s
ubuntu / clang-build (ubuntu-24.04-arm)	58s
ubuntu / clang-build (ubuntu-24.04)	1m 11s
ubuntu / gcc-build (ubuntu-24.04-arm, Debug)	1m 9s
ubuntu / gcc-build (ubuntu-24.04-arm, Release)	1m 0s
ubuntu / gcc-build (ubuntu-24.04, Release)	1m 16s
ubuntu / gcc-build (ubuntu-24.04, Debug)	48s
ubuntu / clang-sanitizer-build (ubuntu-24.04)	1m 5s
ubuntu / clang-test (ubuntu-24.04)	5m 19s
ubuntu / clang-test (ubuntu-24.04-arm)	5m 18s
ubuntu / gcc-test (ubuntu-24.04-arm)	5m 17s
ubuntu / gcc-test (ubuntu-24.04)	5m 23s
mac / clang-test	4m 56s
windows / clang-test	3m 50s
ubuntu / clang-sanitizer-test (ubuntu-24.04)	2m 50s
windows / msvc-test	3m 35s
ubuntu / clang-sanitizer-test-extended (ubuntu-24.04)	1m 25s
windows / clang-test-extended	33s
ubuntu / clang-test-extended	1s
ubuntu / gcc-test-extended	1s
ubuntu / clang-build-codecov	1s
mac / clang-test-extended	1s
windows / msvc-test-extended	1s
perf	0s
pages	0s
	58m 17s

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