Tests

feat(mypyc): proper weakref support #22456

Job	Run time
Test mypyc suite with 32-bit Python	10m 42s
Test suite with py315-ubuntu, mypyc-compiled	15m 38s
Test suite with py313-ubuntu, mypyc-compiled	15m 48s
Test suite with py311-ubuntu	9m 51s
Test suite with py310-ubuntu, mypyc-compiled	16m 47s
Test suite with py314t-ubuntu, mypyc-compiled	17m 42s
Test suite with py312-ubuntu	10m 7s
Test suite with py314-ubuntu, mypyc-compiled	16m 40s
Parallel tests with py314-ubuntu, interpreted	25m 45s
Test suite with py314-windows-64	30m 12s
Formatting and code style with Black + ruff	1m 47s
mypyc runtime tests with py313-macos	6m 31s
Type check our own code (py310-ubuntu)	1m 12s
Parallel tests with py314-windows-64, interpreted	10m 24s
Type check our own code (py310-windows-64)	2m 6s
mypyc runtime tests with py310-ubuntu	6m 56s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 41s
	3h 47m 49s

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