Tests

Enable --allow-redefinition-new on self check #19945

Job	Run time
Test mypyc suite with 32-bit Python	9m 21s
Test suite with py311-ubuntu	9m 12s
Test suite with py314-windows-64	26m 51s
Parallel tests with py314-ubuntu, mypyc-compiled	25m 11s
Test suite with py314t-ubuntu, mypyc-compiled	16m 9s
Test suite with py310-ubuntu, mypyc-compiled	14m 42s
mypyc runtime tests with py310-ubuntu	5m 20s
mypyc runtime tests with py313-macos	7m 10s
Test suite with py313-ubuntu, mypyc-compiled	13m 49s
Test suite with py314-ubuntu, mypyc-compiled	14m 57s
Type check our own code (py310-ubuntu)	1m 39s
Formatting and code style with Black + ruff	2m 2s
Type check our own code (py310-windows-64)	2m 29s
Parallel tests with py314-ubuntu, interpreted	23m 31s
Test suite with py312-ubuntu	9m 51s
	3h 2m 14s

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