Tests

Parse files in parallel when possible #21641

Job	Run time
Test mypyc suite with 32-bit Python	10m 27s
Test suite with py311-ubuntu	9m 1s
Test suite with py312-ubuntu	9m 23s
Test suite with py313-ubuntu, mypyc-compiled	15m 26s
Test suite with py310-ubuntu, mypyc-compiled	15m 59s
Test suite with py314t-ubuntu, mypyc-compiled	20m 30s
Test suite with py314-ubuntu, mypyc-compiled	14m 57s
Test suite with py314-windows-64	27m 56s
Type check our own code (py310-windows-64)	2m 33s
Type check our own code (py310-ubuntu)	1m 36s
Parallel tests with py314-ubuntu, interpreted	25m 51s
mypyc runtime tests with py313-macos	4m 41s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 19s
Formatting and code style with Black + ruff	1m 55s
Parallel tests with py314-windows-64, interpreted	10m 52s
mypyc runtime tests with py310-ubuntu	6m 33s
	3h 24m 59s

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