Tests

[codex] Add walrus allow-redefinition test #22606

Job	Run time
Test mypyc suite with 32-bit Python	11m 9s
Test suite with py313-ubuntu, mypyc-compiled	16m 45s
Test suite with py311-ubuntu	9m 33s
Test suite with py314-windows-64	30m 22s
Test suite with py310-ubuntu, mypyc-compiled	16m 52s
Test suite with py314-ubuntu, mypyc-compiled	15m 35s
Test suite with py314t-ubuntu, mypyc-compiled	18m 0s
Parallel tests with py314-ubuntu, interpreted	26m 49s
Type check our own code (py310-windows-64)	1m 34s
mypyc runtime tests with py310-ubuntu	7m 36s
Parallel tests with py314-windows-64, interpreted	11m 52s
Type check our own code (py310-ubuntu)	1m 10s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 55s
mypyc runtime tests with py313-macos	6m 55s
Test suite with py315-ubuntu, mypyc-compiled	16m 18s
Formatting and code style with Black + ruff	2m 8s
Test suite with py312-ubuntu	9m 52s
	3h 52m 25s

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