Tests

Fix crash when checking file in a read only directory #22298

Job	Run time
Test mypyc suite with 32-bit Python	11m 29s
Test suite with py310-ubuntu, mypyc-compiled	16m 40s
mypyc runtime tests with py313-macos	5m 7s
Test suite with py311-ubuntu	9m 4s
Test suite with py314-ubuntu, mypyc-compiled	15m 45s
Test suite with py312-ubuntu	9m 52s
Test suite with py315-ubuntu, mypyc-compiled	15m 45s
Test suite with py314-windows-64	29m 2s
Parallel tests with py314-ubuntu, interpreted	24m 47s
Test suite with py314t-ubuntu, mypyc-compiled	18m 23s
Formatting and code style with Black + ruff	1m 58s
mypyc runtime tests with py310-ubuntu	6m 37s
Test suite with py313-ubuntu, mypyc-compiled	15m 50s
Parallel tests with py314-windows-64, interpreted	12m 21s
Type check our own code (py310-windows-64)	2m 15s
Type check our own code (py310-ubuntu)	1m 6s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 48s
	3h 44m 49s

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