🎨 Improve flow error messages #1646

Job	Run time
quality_checks_pass	2m 6s
sanitize (undefined, clang)	1s
build_and_test_24 (clang, 16, 20, libstdc++, Debug)	3m 34s
sanitize (undefined, gcc)	1s
build_and_test_22 (clang, 14, 20, libc++, Debug)	2m 31s
build_and_test_24 (clang, 16, 20, libc++, Debug)	3m 38s
valgrind	1s
sanitize (address, clang)	1m 9s
build_and_test_22 (clang, 15, 20, libstdc++, Debug)	2m 48s
build_and_test_24 (clang, 17, 20, libstdc++, Debug)	3m 9s
build_and_test_22 (clang, 15, 20, libc++, Debug)	1m 18s
build_and_test_24 (clang, 17, 20, libc++, Debug)	3m 35s
build_and_test_24 (clang, 18, 20, libstdc++, Debug)	3m 24s
sanitize (address, gcc)	1m 8s
build_and_test_24 (clang, 18, 20, libc++, Debug)	3m 33s
sanitize (thread, clang)	52s
build_and_test_24 (gcc, 12, 20, libstdc++, Debug)	51s
sanitize (thread, gcc)	1s
build_and_test_24 (gcc, 13, 20, libstdc++, Debug)	2m 32s
merge_ok	1s
	36m 13s

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