Tests

Add some additional narrowing test cases #20164

Job	Run time
Test mypyc suite with 32-bit Python	9m 43s
Formatting and code style with Black + ruff	1m 54s
Type check our own code (py310-windows-64)	2m 28s
Test suite with py312-ubuntu	10m 16s
Type check our own code (py310-ubuntu)	1m 41s
Test suite with py313-ubuntu, mypyc-compiled	14m 41s
Test suite with py310-ubuntu, mypyc-compiled	15m 31s
Test suite with py314-windows-64	27m 13s
Test suite with py314t-ubuntu, mypyc-compiled	17m 58s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 47s
Test suite with py314-ubuntu, mypyc-compiled	15m 29s
mypyc runtime tests with py310-ubuntu	5m 36s
Test suite with py311-ubuntu	9m 13s
mypyc runtime tests with py313-macos	5m 42s
Parallel tests with py314-ubuntu, interpreted	23m 0s
	3h 10m 12s

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