Tests

[mypyc] Fix allow_interpreted_subclasses not seeing subclass attrs #21421

Job	Run time
Test mypyc suite with 32-bit Python	9m 58s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 23s
Test suite with py314t-ubuntu, mypyc-compiled	18m 51s
Test suite with py314-ubuntu, mypyc-compiled	15m 28s
Test suite with py311-ubuntu	10m 14s
mypyc runtime tests with py313-macos	4m 23s
Test suite with py310-ubuntu, mypyc-compiled	15m 30s
Parallel tests with py314-windows-64, interpreted	10m 35s
Type check our own code (py310-ubuntu)	1m 52s
Test suite with py313-ubuntu, mypyc-compiled	16m 36s
Formatting and code style with Black + ruff	1m 54s
mypyc runtime tests with py310-ubuntu	6m 4s
Test suite with py314-windows-64	28m 54s
Type check our own code (py310-windows-64)	2m 45s
Test suite with py312-ubuntu	9m 40s
Parallel tests with py314-ubuntu, interpreted	22m 49s
	3h 22m 56s

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