Mark non-test classes with test = False attribute #879

Job	Run time
fossa-scan / Run fossa scan on repository	30s
build (ubuntu-latest, 3.9, 8.2)	7m 21s
build (ubuntu-22.04, 3.7, 8.1)	7m 22s
build (ubuntu-latest, 3.9, latest)	10m 47s
build (ubuntu-latest, 3.9, 8.1)	7m 25s
build (ubuntu-22.04, 3.7, latest)	12m 52s
build (ubuntu-latest, 3.13, 8.2)	7m 12s
build (ubuntu-latest, 3.13, latest)	10m 23s
build (ubuntu-latest, 3.13, 8.1)	8m 21s
build (ubuntu-22.04, 3.7, 8.2)	7m 24s
fossa-scan / Fetch fossa results	1m 0s
	1h 20m 37s

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