Tests

RFC: Rework `*args` parsing #19862

Job	Run time
Test mypyc suite with 32-bit Python	9m 14s
Test suite with py312-ubuntu	9m 57s
Test suite with py314-ubuntu, mypyc-compiled	14m 8s
mypyc runtime tests with py310-ubuntu	5m 7s
Test suite with py310-ubuntu, mypyc-compiled	14m 17s
mypyc runtime tests with py313-macos	4m 36s
Type check our own code (py310-windows-64)	2m 22s
Test suite with py314-windows-64	27m 13s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 7s
Test suite with py313-ubuntu, mypyc-compiled	13m 50s
Formatting and code style with Black + ruff	1m 58s
Parallel tests with py314-ubuntu, interpreted	22m 49s
Test suite with py311-ubuntu	9m 27s
Test suite with py314t-ubuntu, mypyc-compiled	16m 12s
Type check our own code (py310-ubuntu)	1m 40s
	3h 0m 57s

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