Cleanup single fallible case. #11810

Job	Run time
build_opam (4.14.x)	8m 53s
build_js	2m 5s
build_opam (5.2.x)	5m 19s
build_details	5s
build_no_depopts	5m 57s
tree_sitter_parse	55s
build_win32 (x64)	17m 16s
build_posix (debian_trixie, amd64)	15m 31s
lezer_parse	53s
run_tests (@citest)	13m 24s
update_doc	0s
run_tests (@doctest)	8m 29s
build_posix (debian_bookworm, amd64)	15m 18s
run_tests (@mediatest)	12m 46s
build_posix (ubuntu_oracular, amd64)	15m 14s
build_posix (ubuntu_noble, amd64)	16m 38s
build_posix (alpine, amd64)	12m 9s
fetch_s3_artifacts	21s
build_docker (amd64)	1s
build_docker_alpine_minimal	0s
build_docker_alpine	0s
build_docker_minimal	0s
build_docker_release-minimal	0s
build_docker_release	1s
update_release	1s
	2h 31m 16s

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