Tests

Respect explicit return type of new() (#21441) #22410

Job	Run time
Test mypyc suite with 32-bit Python	11m 24s
Test suite with py313-ubuntu, mypyc-compiled	16m 34s
Test suite with py310-ubuntu, mypyc-compiled	16m 48s
Test suite with py312-ubuntu	10m 21s
Parallel tests with py314-ubuntu, interpreted	27m 2s
Type check our own code (py310-windows-64)	2m 2s
Test suite with py314-windows-64	32m 3s
mypyc runtime tests with py313-macos	8m 41s
Test suite with py311-ubuntu	10m 5s
Test suite with py314-ubuntu, mypyc-compiled	16m 44s
Parallel tests with py314-ubuntu, mypyc-compiled	30m 3s
Type check our own code (py310-ubuntu)	1m 10s
Formatting and code style with Black + ruff	1m 47s
Test suite with py315-ubuntu, mypyc-compiled	16m 12s
Parallel tests with py314-windows-64, interpreted	11m 0s
mypyc runtime tests with py310-ubuntu	6m 47s
Test suite with py314t-ubuntu, mypyc-compiled	18m 46s
	3h 57m 29s

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