Tests

Improve match statement union narrowing/inference #20227

Job	Run time
Test mypyc suite with 32-bit Python	9m 51s
Type check our own code (py310-ubuntu)	1m 42s
Test suite with py314-windows-64	27m 35s
Test suite with py312-ubuntu	9m 55s
Type check our own code (py310-windows-64)	2m 21s
Test suite with py313-ubuntu, mypyc-compiled	14m 49s
Parallel tests with py314-ubuntu, interpreted	23m 39s
Test suite with py314-ubuntu, mypyc-compiled	14m 55s
mypyc runtime tests with py313-macos	6m 31s
Test suite with py314t-ubuntu, mypyc-compiled	17m 24s
Formatting and code style with Black + ruff	1m 54s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 15s
mypyc runtime tests with py310-ubuntu	5m 37s
Test suite with py311-ubuntu	9m 22s
Test suite with py310-ubuntu, mypyc-compiled	15m 9s
	3h 8m 59s

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