Tests

[codex] Add walrus allow-redefinition test #22607

Job	Run time
Test mypyc suite with 32-bit Python	11m 2s
Test suite with py313-ubuntu, mypyc-compiled	15m 44s
Test suite with py311-ubuntu	9m 37s
Test suite with py312-ubuntu	9m 53s
Test suite with py314-ubuntu, mypyc-compiled	15m 46s
Type check our own code (py310-ubuntu)	1m 11s
Parallel tests with py314-ubuntu, interpreted	24m 10s
mypyc runtime tests with py310-ubuntu	7m 26s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 10s
Test suite with py315-ubuntu, mypyc-compiled	16m 15s
Parallel tests with py314-windows-64, interpreted	11m 1s
Test suite with py314t-ubuntu, mypyc-compiled	18m 25s
Formatting and code style with Black + ruff	1m 53s
mypyc runtime tests with py313-macos	6m 15s
Test suite with py314-windows-64	32m 49s
Type check our own code (py310-windows-64)	2m 21s
Test suite with py310-ubuntu, mypyc-compiled	16m 21s
	3h 47m 19s

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