Tests

Fix spurious possibly-undefined errors in for-else with break #20233

Job	Run time
Test mypyc suite with 32-bit Python	1m 14s
Test suite with py311-ubuntu	1m 24s
Test suite with py312-ubuntu	1m 23s
Test suite with py314-windows-64	1m 17s
mypyc runtime tests with py313-macos	1m 30s
Test suite with py310-ubuntu, mypyc-compiled	1m 23s
Test suite with py314t-ubuntu, mypyc-compiled	1m 23s
mypyc runtime tests with py310-ubuntu	1m 26s
Test suite with py314-ubuntu, mypyc-compiled	1m 23s
Test suite with py313-ubuntu, mypyc-compiled	1m 23s
Formatting and code style with Black + ruff	1m 26s
Type check our own code (py310-ubuntu)	1m 26s
Type check our own code (py310-windows-64)	1m 19s
Parallel tests with py314-ubuntu, interpreted	1m 24s
Parallel tests with py314-ubuntu, mypyc-compiled	1m 24s
	20m 45s

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