Tests

Respect explicit return type of new() #22392

Job	Run time
Test mypyc suite with 32-bit Python	10m 35s
Test suite with py310-ubuntu, mypyc-compiled	17m 55s
Test suite with py312-ubuntu	10m 2s
Test suite with py311-ubuntu	9m 28s
Test suite with py315-ubuntu, mypyc-compiled	15m 38s
Test suite with py314-ubuntu, mypyc-compiled	16m 33s
mypyc runtime tests with py310-ubuntu	7m 23s
Test suite with py314t-ubuntu, mypyc-compiled	18m 15s
Parallel tests with py314-ubuntu, interpreted	26m 52s
Type check our own code (py310-ubuntu)	1m 9s
Type check our own code (py310-windows-64)	1m 53s
mypyc runtime tests with py313-macos	5m 16s
Test suite with py314-windows-64	26m 22s
Test suite with py313-ubuntu, mypyc-compiled	16m 32s
Formatting and code style with Black + ruff	1m 54s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 9s
Parallel tests with py314-windows-64, interpreted	17m 7s
	3h 51m 3s

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