Tests

Avoid false `possibly-undefined` errors due to omitted unrequired else statements. #19366

Job	Run time
Test mypyc suite with 32-bit Python	1m 32s
Test suite with py314-ubuntu, mypyc-compiled	1m 42s
Test suite with py311-ubuntu	1m 42s
Test suite with py39-ubuntu, mypyc-compiled	1m 42s
Test suite with py310-ubuntu	1m 42s
Test suite with py312-ubuntu, mypyc-compiled	1m 41s
Test suite with py314-windows-64	1m 38s
mypyc runtime tests with py310-ubuntu	1m 46s
Test suite with py313-ubuntu, mypyc-compiled	1m 38s
Formatting and code style with Black + ruff	1m 45s
mypyc runtime tests with py313-macos	1m 47s
Type check our own code (py39-windows-64)	1m 38s
Type check our own code (py39-ubuntu)	1m 37s
	21m 50s

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