Tests

Optimize parallel workers start-up #21639

Job	Run time
Test mypyc suite with 32-bit Python	10m 25s
Test suite with py311-ubuntu	9m 5s
Test suite with py310-ubuntu, mypyc-compiled	15m 53s
Test suite with py313-ubuntu, mypyc-compiled	15m 39s
Test suite with py312-ubuntu	10m 3s
Parallel tests with py314-ubuntu, mypyc-compiled	25m 2s
Test suite with py314-windows-64	27m 46s
Type check our own code (py310-ubuntu)	1m 44s
Parallel tests with py314-windows-64, interpreted	9m 2s
mypyc runtime tests with py310-ubuntu	6m 28s
Type check our own code (py310-windows-64)	2m 18s
Test suite with py314-ubuntu, mypyc-compiled	15m 25s
Formatting and code style with Black + ruff	1m 53s
Parallel tests with py314-ubuntu, interpreted	24m 54s
Test suite with py314t-ubuntu, mypyc-compiled	23m 7s
mypyc runtime tests with py313-macos	4m 47s
	3h 23m 31s

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