Tests

Fix various crashes on recursive type variable defaults #22291

Job	Run time
mypyc runtime tests with py313-macos	6m 46s
Type check our own code (py310-ubuntu)	1m 4s
Parallel tests with py314-ubuntu, mypyc-compiled	1m 24s
Test suite with py314-windows-64	17m 49s
Parallel tests with py314-ubuntu, interpreted	17m 52s
Formatting and code style with Black + ruff	1m 58s
Test suite with py311-ubuntu	9m 29s
Test suite with py313-ubuntu, mypyc-compiled	1m 23s
Test suite with py314t-ubuntu, mypyc-compiled	1m 34s
Test suite with py314-ubuntu, mypyc-compiled	1m 20s
Test suite with py310-ubuntu, mypyc-compiled	1m 54s
Test suite with py315-ubuntu, mypyc-compiled	1m 41s
Parallel tests with py314-windows-64, interpreted	10m 33s
mypyc runtime tests with py310-ubuntu	7m 15s
Test suite with py312-ubuntu	10m 0s
Type check our own code (py310-windows-64)	2m 2s
Test mypyc suite with 32-bit Python	11m 22s
	1h 45m 26s

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