move FilePermissionTest to unit folder #884

Job	Run time
fossa-scan / Run fossa scan on repository	34s
build (ubuntu-latest, 3.9, latest)	10m 33s
build (ubuntu-22.04, 3.7, 8.2)	8m 7s
build (ubuntu-latest, 3.9, 8.2)	8m 3s
build (ubuntu-latest, 3.13, 8.1)	7m 17s
build (ubuntu-latest, 3.13, latest)	12m 0s
build (ubuntu-latest, 3.9, 8.1)	7m 15s
build (ubuntu-22.04, 3.7, 8.1)	8m 8s
build (ubuntu-latest, 3.13, 8.2)	7m 58s
build (ubuntu-22.04, 3.7, latest)	12m 43s
fossa-scan / Fetch fossa results	1m 4s
	1h 23m 42s

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