Tests

A test switch to --allow-redefnition-new #21102

Job	Run time
Test mypyc suite with 32-bit Python	9m 57s
Test suite with py311-ubuntu	8m 27s
Parallel tests with py314-ubuntu, mypyc-compiled	30m 11s
mypyc runtime tests with py310-ubuntu	6m 2s
Test suite with py313-ubuntu, mypyc-compiled	14m 14s
mypyc runtime tests with py313-macos	5m 36s
Test suite with py314-windows-64	27m 14s
Test suite with py310-ubuntu, mypyc-compiled	15m 0s
Test suite with py314t-ubuntu, mypyc-compiled	16m 43s
Parallel tests with py314-ubuntu, interpreted	23m 20s
Parallel tests with py314-windows-64, interpreted	10m 33s
Formatting and code style with Black + ruff	2m 1s
Test suite with py314-ubuntu, mypyc-compiled	14m 9s
Test suite with py312-ubuntu	8m 52s
Type check our own code (py310-windows-64)	2m 39s
Type check our own code (py310-ubuntu)	1m 43s
	3h 16m 41s

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