Tests

Respect explicit return type of new() #22407

Job	Run time
Test suite with py312-ubuntu	10m 25s
Test mypyc suite with 32-bit Python	11m 30s
Test suite with py310-ubuntu, mypyc-compiled	16m 52s
Test suite with py314-ubuntu, mypyc-compiled	16m 14s
Test suite with py315-ubuntu, mypyc-compiled	16m 8s
Test suite with py314-windows-64	32m 57s
Test suite with py311-ubuntu	9m 33s
Test suite with py313-ubuntu, mypyc-compiled	16m 31s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 29s
mypyc runtime tests with py310-ubuntu	6m 46s
Type check our own code (py310-ubuntu)	1m 19s
Parallel tests with py314-ubuntu, interpreted	24m 18s
Type check our own code (py310-windows-64)	2m 24s
Formatting and code style with Black + ruff	1m 44s
mypyc runtime tests with py313-macos	6m 15s
Test suite with py314t-ubuntu, mypyc-compiled	17m 53s
Parallel tests with py314-windows-64, interpreted	9m 40s
	3h 48m 58s

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