Tests

[WIP] test parallel checking #21902

Job	Run time
Test mypyc suite with 32-bit Python	10m 17s
Test suite with py314-ubuntu, mypyc-compiled	19m 5s
Test suite with py311-ubuntu	11m 44s
Test suite with py314-windows-64	33m 16s
Test suite with py313-ubuntu, mypyc-compiled	19m 9s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 28s
Test suite with py314t-ubuntu, mypyc-compiled	20m 24s
Parallel tests with py314-ubuntu, interpreted	24m 40s
Test suite with py310-ubuntu, mypyc-compiled	28m 34s
mypyc runtime tests with py310-ubuntu	6m 31s
Test suite with py312-ubuntu	12m 9s
Formatting and code style with Black + ruff	1m 48s
Parallel tests with py314-windows-64, interpreted	9m 44s
Type check our own code (py310-ubuntu)	1m 10s
mypyc runtime tests with py313-macos	5m 55s
Type check our own code (py310-windows-64)	2m 10s
	3h 54m 4s

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