Tests

Better handling of generics when narrowing #20977

Job	Run time
Test mypyc suite with 32-bit Python	9m 53s
Test suite with py313-ubuntu, mypyc-compiled	14m 37s
Test suite with py314-ubuntu, mypyc-compiled	14m 31s
Test suite with py314-windows-64	26m 8s
Test suite with py310-ubuntu, mypyc-compiled	15m 0s
Test suite with py311-ubuntu	8m 32s
Type check our own code (py310-ubuntu)	1m 40s
Test suite with py312-ubuntu	8m 49s
Test suite with py314t-ubuntu, mypyc-compiled	16m 27s
Parallel tests with py314-ubuntu, interpreted	24m 58s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 38s
Formatting and code style with Black + ruff	1m 56s
mypyc runtime tests with py313-macos	4m 27s
Parallel tests with py314-windows-64, interpreted	10m 26s
Type check our own code (py310-windows-64)	2m 25s
mypyc runtime tests with py310-ubuntu	5m 35s
	3h 15m 2s

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