Tests

[stubtest] Verify all exists in stub #13672

Job	Run time
Test mypyc suite with 32-bit Python	7m 20s
Test suite with py38-ubuntu, mypyc-compiled	18m 0s
Test suite with py38-windows-64	20m 12s
Test suite with py39-ubuntu	16m 36s
Test suite with py310-ubuntu	15m 56s
Test suite with py311-ubuntu, mypyc-compiled	15m 52s
Test suite with py312-ubuntu, mypyc-compiled	17m 59s
Test suite with py313-ubuntu, mypyc-compiled	18m 12s
mypyc runtime tests with py39-macos	5m 44s
Type check our own code (py38-ubuntu)	2m 0s
Type check our own code (py38-windows-64)	2m 20s
Formatting and code style with Black + ruff	31s
	2h 20m 42s

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