Tests

Fix/semanal nested class scope #19659

Job	Run time
Test mypyc suite with 32-bit Python	4m 3s
Test suite with py314t-ubuntu, mypyc-compiled	43s
Test suite with py313-ubuntu, mypyc-compiled	34s
Test suite with py310-ubuntu, mypyc-compiled	28s
Test suite with py314-windows-64	13m 33s
Test suite with py312-ubuntu	7m 13s
Parallel tests with py314-ubuntu, interpreted	28m 23s
Test suite with py314-ubuntu, mypyc-compiled	29s
mypyc runtime tests with py310-ubuntu	1m 3s
Type check our own code (py310-ubuntu)	39s
Test suite with py311-ubuntu	6m 5s
mypyc runtime tests with py313-macos	44s
Parallel tests with py314-ubuntu, mypyc-compiled	29s
Type check our own code (py310-windows-64)	1m 43s
Formatting and code style with Black + ruff	1m 47s
	1h 7m 56s

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