Tests

[WIP] test parallel checking #21923

Job	Run time
Test mypyc suite with 32-bit Python	10m 59s
Test suite with py310-ubuntu, mypyc-compiled	20m 19s
mypyc runtime tests with py310-ubuntu	6m 43s
Test suite with py312-ubuntu	12m 35s
Test suite with py313-ubuntu, mypyc-compiled	17m 43s
Type check our own code (py310-windows-64)	2m 52s
mypyc runtime tests with py313-macos	7m 25s
Formatting and code style with Black + ruff	1m 49s
Test suite with py311-ubuntu	11m 31s
Test suite with py314-windows-64	34m 44s
Test suite with py314-ubuntu, mypyc-compiled	17m 57s
Test suite with py314t-ubuntu, mypyc-compiled	20m 25s
Type check our own code (py310-ubuntu)	1m 44s
Parallel tests with py314-windows-64, interpreted	10m 34s
Parallel tests with py314-ubuntu, interpreted	23m 48s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 12s
	3h 49m 20s

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