Don't retain passive clocks at top-level #11737

Job	Run time
build_js	2m 0s
build_opam (4.14.x)	9m 2s
build_details	2s
build_opam (5.2.x)	5m 23s
lezer_parse	52s
build_no_depopts	6m 18s
build_win32 (x64)	17m 26s
build_posix (debian_trixie, amd64)	15m 6s
run_tests (@citest)	12m 45s
build_posix (debian_bookworm, amd64)	15m 10s
run_tests (@doctest)	8m 7s
tree_sitter_parse	48s
build_posix (ubuntu_oracular, amd64)	14m 22s
update_doc	0s
run_tests (@mediatest)	12m 44s
build_posix (ubuntu_noble, amd64)	15m 6s
build_posix (alpine, amd64)	11m 40s
fetch_s3_artifacts	26s
build_docker (amd64)	2m 24s
build_docker_alpine (amd64)	1m 33s
build_docker_alpine_minimal (amd64)	50s
build_docker_minimal (amd64)	2m 5s
update_release	0s
build_docker_release-minimal	0s
build_docker_release	0s
	2h 34m 9s

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