Fix: Exit if any config error #10810

Job	Run time
Test mypyc suite with 32-bit Python	10m 36s
Test suite with py38-ubuntu, mypyc-compiled	27m 13s
Test suite with py38-windows-64	33m 45s
Test suite with py39-ubuntu	26m 30s
Test suite with py310-ubuntu	27m 47s
Test suite with py311-ubuntu, mypyc-compiled	23m 36s
Test suite with py312-ubuntu, mypyc-compiled	33m 5s
mypyc runtime tests with py38-macos	9m 0s
mypyc runtime tests with py38-debug-build-ubuntu	8m 10s
Type check our own code (py38-ubuntu)	3m 7s
Type check our own code (py38-windows-64)	3m 35s
Formatting and code style with Black + ruff	40s
	3h 27m 4s

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