move FilePermissionTest to unit folder #885

Job	Run time
fossa-scan / Run fossa scan on repository	31s
build (ubuntu-latest, 3.9, latest)	12m 39s
build (ubuntu-latest, 3.13, 8.2)	8m 4s
build (ubuntu-latest, 3.13, 8.1)	7m 49s
build (ubuntu-latest, 3.9, 8.1)	7m 58s
build (ubuntu-latest, 3.13, latest)	12m 7s
build (ubuntu-22.04, 3.7, latest)	11m 56s
build (ubuntu-22.04, 3.7, 8.1)	7m 54s
build (ubuntu-latest, 3.9, 8.2)	7m 55s
build (ubuntu-22.04, 3.7, 8.2)	7m 58s
fossa-scan / Fetch fossa results	3m 45s
	1h 28m 36s

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