Tests

Add back support for warn_unused_configs #20890

Job	Run time
Test mypyc suite with 32-bit Python	9m 37s
Test suite with py311-ubuntu	8m 33s
Test suite with py314t-ubuntu, mypyc-compiled	16m 54s
Test suite with py310-ubuntu, mypyc-compiled	15m 5s
Test suite with py314-ubuntu, mypyc-compiled	13m 54s
Parallel tests with py314-windows-64, interpreted	10m 25s
Test suite with py313-ubuntu, mypyc-compiled	14m 3s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 13s
Type check our own code (py310-windows-64)	2m 30s
mypyc runtime tests with py310-ubuntu	5m 40s
mypyc runtime tests with py313-macos	6m 45s
Parallel tests with py314-ubuntu, interpreted	24m 7s
Formatting and code style with Black + ruff	1m 45s
Type check our own code (py310-ubuntu)	1m 44s
Test suite with py314-windows-64	27m 24s
Test suite with py312-ubuntu	9m 7s
	3h 16m 46s

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