Tests

Further improve match statement narrowing against unions #20789

Job	Run time
Test mypyc suite with 32-bit Python	9m 48s
Test suite with py314-ubuntu, mypyc-compiled	14m 37s
mypyc runtime tests with py310-ubuntu	5m 41s
Parallel tests with py314-ubuntu, interpreted	25m 10s
Test suite with py314t-ubuntu, mypyc-compiled	16m 20s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 4s
Type check our own code (py310-windows-64)	2m 13s
Test suite with py311-ubuntu	8m 45s
mypyc runtime tests with py313-macos	7m 59s
Formatting and code style with Black + ruff	2m 1s
Test suite with py314-windows-64	24m 56s
Test suite with py312-ubuntu	9m 11s
Type check our own code (py310-ubuntu)	1m 41s
Test suite with py310-ubuntu, mypyc-compiled	14m 41s
Test suite with py313-ubuntu, mypyc-compiled	13m 39s
	3h 5m 46s

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