Tests

Use parallel checking in self check #21730

Job	Run time
Test mypyc suite with 32-bit Python	10m 9s
Parallel tests with py314-ubuntu, interpreted	24m 58s
Type check our own code (py310-windows-64)	2m 4s
Test suite with py311-ubuntu	9m 11s
Test suite with py312-ubuntu	9m 42s
Test suite with py314-windows-64	28m 16s
Test suite with py310-ubuntu, mypyc-compiled	16m 16s
Test suite with py313-ubuntu, mypyc-compiled	15m 20s
mypyc runtime tests with py310-ubuntu	6m 14s
Test suite with py314t-ubuntu, mypyc-compiled	17m 7s
mypyc runtime tests with py313-macos	10m 9s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 42s
Test suite with py314-ubuntu, mypyc-compiled	15m 23s
Parallel tests with py314-windows-64, interpreted	8m 6s
Type check our own code (py310-ubuntu)	1m 11s
Formatting and code style with Black + ruff	1m 50s
	3h 23m 38s

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