Mark non-test classes with test = False attribute #878

Job	Run time
build (ubuntu-latest, 3.9, latest)	11m 29s
build (ubuntu-latest, 3.9, 8.2)	7m 25s
build (ubuntu-latest, 3.13, 8.1)	7m 24s
build (ubuntu-latest, 3.9, 8.1)	7m 23s
build (ubuntu-latest, 3.13, latest)	11m 24s
build (ubuntu-22.04, 3.7, 8.2)	7m 30s
build (ubuntu-latest, 3.13, 8.2)	7m 27s
build (ubuntu-22.04, 3.7, 8.1)	7m 31s
fossa-scan / Run fossa scan on repository	37s
build (ubuntu-22.04, 3.7, latest)	10m 43s
fossa-scan / Fetch fossa results	1m 15s
	1h 20m 8s

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