Tests

Respect explicit return type of new() #22391

Job	Run time
Test mypyc suite with 32-bit Python	10m 49s
Test suite with py315-ubuntu, mypyc-compiled	16m 8s
Test suite with py312-ubuntu	10m 5s
Test suite with py314-ubuntu, mypyc-compiled	16m 3s
Test suite with py311-ubuntu	9m 24s
Test suite with py313-ubuntu, mypyc-compiled	15m 54s
Test suite with py310-ubuntu, mypyc-compiled	17m 15s
Test suite with py314t-ubuntu, mypyc-compiled	17m 38s
Parallel tests with py314-ubuntu, mypyc-compiled	31m 9s
mypyc runtime tests with py310-ubuntu	7m 16s
Type check our own code (py310-windows-64)	1m 50s
mypyc runtime tests with py313-macos	6m 15s
Formatting and code style with Black + ruff	1m 52s
Parallel tests with py314-windows-64, interpreted	11m 21s
Parallel tests with py314-ubuntu, interpreted	24m 39s
Type check our own code (py310-ubuntu)	1m 10s
Test suite with py314-windows-64	28m 25s
	3h 47m 13s

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