Tests

Add support for Pydantic models in `stubgen` #15767

Job	Run time
Test mypyc suite with 32-bit Python	7m 56s
Test suite with py39-ubuntu, mypyc-compiled	16m 3s
Test suite with py39-windows-64	22m 36s
Test suite with py310-ubuntu	11m 15s
Test suite with py311-ubuntu, mypyc-compiled	12m 28s
Test suite with py312-ubuntu, mypyc-compiled	14m 27s
Test suite with py313-ubuntu, mypyc-compiled	14m 7s
mypyc runtime tests with py39-macos	5m 24s
Type check our own code (py39-ubuntu)	1m 59s
Type check our own code (py39-windows-64)	3m 1s
Formatting and code style with Black + ruff	1m 46s
	1h 51m 2s

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