Tests

Make --allow-redefinition mean --allow-redefinition-new (#21276) #21867

Job	Run time
Test mypyc suite with 32-bit Python	10m 59s
Test suite with py311-ubuntu	8m 58s
Test suite with py314-ubuntu, mypyc-compiled	15m 38s
Test suite with py310-ubuntu, mypyc-compiled	16m 32s
Test suite with py314t-ubuntu, mypyc-compiled	17m 36s
Test suite with py312-ubuntu	9m 37s
Parallel tests with py314-ubuntu, interpreted	25m 6s
Type check our own code (py310-windows-64)	4m 0s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 33s
Formatting and code style with Black + ruff	1m 49s
Type check our own code (py310-ubuntu)	1m 6s
Parallel tests with py314-windows-64, interpreted	8m 2s
mypyc runtime tests with py310-ubuntu	6m 26s
Test suite with py314-windows-64	27m 27s
Test suite with py313-ubuntu, mypyc-compiled	15m 15s
mypyc runtime tests with py313-macos	6m 54s
	3h 23m 58s

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