Tests

[stubtest] temporary `--ignore-disjoint-bases` flag #17696

Job	Run time
Test mypyc suite with 32-bit Python	8m 55s
Test suite with py311-ubuntu	8m 55s
Test suite with py312-ubuntu, mypyc-compiled	25m 48s
Test suite with py310-ubuntu	11m 16s
Test suite with py314-dev-ubuntu	25m 48s
mypyc runtime tests with py39-macos	5m 39s
Test suite with py39-ubuntu, mypyc-compiled	20m 1s
Test suite with py313-ubuntu, mypyc-compiled	21m 35s
Type check our own code (py39-ubuntu)	1m 35s
Type check our own code (py39-windows-64)	2m 14s
Test suite with py313-windows-64	22m 48s
Formatting and code style with Black + ruff	2m 0s
	2h 36m 34s

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