Tests

Initial implementation of parallel type checking (#20280) #19583

Job	Run time
Test mypyc suite with 32-bit Python	9m 6s
Test suite with py310-ubuntu, mypyc-compiled	14m 26s
Test suite with py312-ubuntu	10m 15s
Test suite with py311-ubuntu	9m 9s
Test suite with py313-ubuntu, mypyc-compiled	13m 46s
Test suite with py314-ubuntu, mypyc-compiled	14m 14s
mypyc runtime tests with py310-ubuntu	5m 7s
mypyc runtime tests with py313-macos	4m 9s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 13s
Parallel tests with py314-ubuntu, interpreted	25m 10s
Test suite with py314-windows-64	27m 27s
Type check our own code (py310-ubuntu)	1m 32s
Type check our own code (py310-windows-64)	2m 22s
Formatting and code style with Black + ruff	1m 53s
	2h 47m 49s

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