Tests

Parse files in parallel when possible #21569

Job	Run time
Test mypyc suite with 32-bit Python	10m 36s
Test suite with py314-ubuntu, mypyc-compiled	16m 2s
Test suite with py310-ubuntu, mypyc-compiled	17m 13s
Test suite with py314t-ubuntu, mypyc-compiled	20m 27s
Test suite with py313-ubuntu, mypyc-compiled	15m 31s
Test suite with py314-windows-64	29m 23s
Type check our own code (py310-ubuntu)	1m 44s
Parallel tests with py314-ubuntu, interpreted	22m 52s
Type check our own code (py310-windows-64)	2m 22s
Formatting and code style with Black + ruff	2m 7s
Test suite with py312-ubuntu	10m 42s
Parallel tests with py314-windows-64, interpreted	10m 59s
Test suite with py311-ubuntu	10m 0s
mypyc runtime tests with py313-macos	5m 56s
mypyc runtime tests with py310-ubuntu	6m 36s
Parallel tests with py314-ubuntu, mypyc-compiled	26m 48s
	3h 29m 18s

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