Tests

Fix various crashes on recursive type variable defaults #22293

Job	Run time
Test mypyc suite with 32-bit Python	11m 49s
mypyc runtime tests with py310-ubuntu	7m 0s
Test suite with py310-ubuntu, mypyc-compiled	17m 9s
mypyc runtime tests with py313-macos	6m 34s
Parallel tests with py314-ubuntu, interpreted	25m 41s
Formatting and code style with Black + ruff	2m 4s
Test suite with py315-ubuntu, mypyc-compiled	16m 18s
Parallel tests with py314-windows-64, interpreted	10m 47s
Test suite with py311-ubuntu	10m 6s
Test suite with py313-ubuntu, mypyc-compiled	15m 19s
Type check our own code (py310-windows-64)	2m 0s
Test suite with py314-ubuntu, mypyc-compiled	16m 0s
Test suite with py314t-ubuntu, mypyc-compiled	18m 15s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 26s
Test suite with py312-ubuntu	10m 12s
Type check our own code (py310-ubuntu)	1m 14s
Test suite with py314-windows-64	31m 57s
	3h 51m 51s

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