Add LLVM-based coverage generation support #3779

Job	Run time
pre-commit / pre-commit	2m 29s
mac / clang-build (Release)	2m 23s
mac / clang-build (Debug)	2m 2s
ubuntu / gcc-build (ubuntu-24.04, Debug)	49s
ubuntu / gcc-build (ubuntu-24.04, Release)	49s
ubuntu / clang-build (ubuntu-24.04-arm)	1m 28s
ubuntu / gcc-build (ubuntu-24.04-arm, Debug)	1m 32s
ubuntu / gcc-build (ubuntu-24.04-arm, Release)	1m 31s
windows / msvc-build (Debug)	5m 31s
ubuntu / clang-build-codecov	1m 44s
ubuntu / clang-build (ubuntu-24.04)	59s
windows / clang-build	2m 40s
windows / msvc-build (Release)	2m 52s
ubuntu / clang-test (ubuntu-24.04)	6m 38s
ubuntu / clang-test (ubuntu-24.04-arm)	6m 39s
ubuntu / clang-sanitizer-build (ubuntu-24.04)	2m 58s
ubuntu / gcc-test (ubuntu-24.04)	6m 30s
ubuntu / gcc-test (ubuntu-24.04-arm)	6m 28s
mac / clang-test	5m 24s
windows / clang-test	2m 58s
ubuntu / clang-sanitizer-test (ubuntu-24.04)	2m 50s
windows / msvc-test	2m 52s
windows / clang-test-extended	2m 41s
ubuntu / clang-sanitizer-test-extended (ubuntu-24.04)	43s
mac / clang-test-extended	32s
ubuntu / gcc-test-extended	1s
ubuntu / clang-test-extended	1s
windows / msvc-test-extended	1s
perf	0s
pages	0s
	1h 14m 5s

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