Tests

Fix crash when checking file in a read only directory #22297

Job	Run time
Test mypyc suite with 32-bit Python	11m 36s
Test suite with py312-ubuntu	9m 48s
Test suite with py313-ubuntu, mypyc-compiled	15m 31s
Test suite with py311-ubuntu	9m 25s
Test suite with py314-ubuntu, mypyc-compiled	16m 23s
Parallel tests with py314-ubuntu, mypyc-compiled	17m 28s
Test suite with py315-ubuntu, mypyc-compiled	15m 24s
Test suite with py314t-ubuntu, mypyc-compiled	17m 7s
mypyc runtime tests with py310-ubuntu	6m 54s
Test suite with py314-windows-64	17m 24s
Test suite with py310-ubuntu, mypyc-compiled	16m 37s
Parallel tests with py314-ubuntu, interpreted	17m 27s
Parallel tests with py314-windows-64, interpreted	11m 19s
mypyc runtime tests with py313-macos	5m 4s
Type check our own code (py310-ubuntu)	1m 5s
Formatting and code style with Black + ruff	1m 47s
Type check our own code (py310-windows-64)	1m 45s
	3h 12m 4s

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