Fix: Exit if any config error #11251

Job	Run time
Test mypyc suite with 32-bit Python	13m 33s
Test suite with py38-ubuntu, mypyc-compiled	24m 39s
Test suite with py38-windows-64	40m 44s
Test suite with py39-ubuntu	28m 32s
Test suite with py310-ubuntu	22m 18s
Test suite with py311-ubuntu, mypyc-compiled	20m 6s
Test suite with py312-ubuntu, mypyc-compiled	33m 43s
mypyc runtime tests with py38-macos	10m 42s
mypyc runtime tests with py38-debug-build-ubuntu	6m 46s
Type check our own code (py38-ubuntu)	2m 55s
Type check our own code (py38-windows-64)	3m 35s
Formatting and code style with Black + ruff	41s
	3h 28m 14s

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