Lint

Make test_tests_collected_once actually verify coverage #7740

Job	Run time
build (3.13, windows-latest, manual)	2m 1s
build (3.13, windows-latest, pre-push)	7m 59s
build (3.13, ubuntu-latest, pre-commit)	56s
build (3.13, windows-latest, pre-commit)	2m 36s
build (3.13, ubuntu-latest, pre-push)	6m 49s
build (3.13, ubuntu-latest, manual)	54s
completion-lint	2s
	21m 17s

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