Tests

Fix various crashes on recursive type variable defaults #22294

Job	Run time
Test mypyc suite with 32-bit Python	11m 33s
Test suite with py310-ubuntu, mypyc-compiled	17m 19s
Formatting and code style with Black + ruff	1m 48s
Type check our own code (py310-windows-64)	3m 2s
Test suite with py314-ubuntu, mypyc-compiled	16m 21s
Test suite with py315-ubuntu, mypyc-compiled	16m 38s
Test suite with py314t-ubuntu, mypyc-compiled	17m 29s
Parallel tests with py314-ubuntu, mypyc-compiled	30m 38s
Test suite with py314-windows-64	32m 11s
Test suite with py312-ubuntu	10m 18s
Test suite with py313-ubuntu, mypyc-compiled	16m 46s
mypyc runtime tests with py310-ubuntu	6m 49s
Type check our own code (py310-ubuntu)	1m 9s
Parallel tests with py314-windows-64, interpreted	11m 12s
Parallel tests with py314-ubuntu, interpreted	25m 21s
mypyc runtime tests with py313-macos	6m 51s
Test suite with py311-ubuntu	9m 46s
	3h 55m 11s

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