Tests

Fix false negative with walrus operator in tuples #20278

Job	Run time
Test mypyc suite with 32-bit Python	9m 35s
Parallel tests with py314-ubuntu, interpreted	25m 9s
Test suite with py314-windows-64	24m 29s
Test suite with py312-ubuntu	9m 56s
Test suite with py313-ubuntu, mypyc-compiled	15m 21s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 42s
Test suite with py314t-ubuntu, mypyc-compiled	17m 38s
mypyc runtime tests with py310-ubuntu	5m 43s
Type check our own code (py310-ubuntu)	1m 44s
Test suite with py310-ubuntu, mypyc-compiled	15m 28s
Test suite with py311-ubuntu	9m 53s
Type check our own code (py310-windows-64)	2m 23s
Test suite with py314-ubuntu, mypyc-compiled	15m 6s
mypyc runtime tests with py313-macos	6m 18s
Formatting and code style with Black + ruff	1m 49s
	3h 9m 14s

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