Tests

Parse files in parallel when possible #21655

Job	Run time
Test mypyc suite with 32-bit Python	10m 33s
Test suite with py311-ubuntu	9m 17s
Test suite with py310-ubuntu, mypyc-compiled	15m 28s
Test suite with py314-ubuntu, mypyc-compiled	15m 55s
Test suite with py314t-ubuntu, mypyc-compiled	21m 30s
Test suite with py312-ubuntu	9m 21s
Test suite with py313-ubuntu, mypyc-compiled	15m 36s
mypyc runtime tests with py313-macos	7m 55s
Parallel tests with py314-ubuntu, interpreted	26m 12s
Parallel tests with py314-windows-64, interpreted	9m 46s
Type check our own code (py310-windows-64)	2m 23s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 1s
Type check our own code (py310-ubuntu)	1m 49s
mypyc runtime tests with py310-ubuntu	6m 27s
Test suite with py314-windows-64	28m 16s
Formatting and code style with Black + ruff	1m 52s
	3h 30m 21s

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