re-express `starts_on` in terms of the `__sequence` algorithm #2918

Job	Run time
macos-CPU (MacOS) (clang, Debug)	4m 51s
macos-CPU (MacOS) (clang, Release)	4m 22s
CPU (Windows) (msvc, Release)	18s
CPU (Windows) (msvc, Debug)	12m 6s
CPU (clang 16, Debug)	9m 17s
CPU (clang 16, Release)	9m 21s
CPU (clang 16, Debug, c++23)	8m 53s
CPU (clang 16, Release, ASAN)	9m 18s
CPU (gcc 11, Release)	10m 18s
CPU (gcc 11, Debug)	10m 3s
CPU (gcc 14, Release, c++23)	10m 49s
CPU (gcc 12, Release, TSAN)	10m 58s
CPU (gcc 11, Release, ASAN)	11m 13s
CPU (gcc 13, Debug)	10m 21s
CPU (gcc 14, Release, LEAK)	10m 41s
CI (CPU) (MacOS)	4s
CI (CPU)	2s
CI (CPU) (Windows)	0s
	2h 12m 55s

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