Lint

Make test_tests_collected_once actually verify coverage (#3130) #7743

Job	Run time
build (3.13, windows-latest, manual)	1m 48s
build (3.13, windows-latest, pre-push)	7m 33s
build (3.13, ubuntu-latest, manual)	51s
build (3.13, ubuntu-latest, pre-push)	5m 46s
build (3.13, windows-latest, pre-commit)	1m 57s
build (3.13, ubuntu-latest, pre-commit)	53s
completion-lint	2s
	18m 50s

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