Tests

Add a flag `--enable-all-error-codes`, which enables all error codes #19741

Job	Run time
Test mypyc suite with 32-bit Python	9m 24s
Test suite with py314t-ubuntu, mypyc-compiled	15m 54s
Test suite with py313-ubuntu, mypyc-compiled	13m 41s
Test suite with py312-ubuntu	10m 2s
Test suite with py311-ubuntu	8m 49s
Test suite with py314-ubuntu, mypyc-compiled	13m 50s
mypyc runtime tests with py313-macos	5m 12s
Test suite with py314-windows-64	27m 45s
Parallel tests with py314-ubuntu, interpreted	22m 15s
Formatting and code style with Black + ruff	1m 59s
Type check our own code (py310-windows-64)	2m 24s
Test suite with py310-ubuntu, mypyc-compiled	14m 40s
Type check our own code (py310-ubuntu)	1m 40s
mypyc runtime tests with py310-ubuntu	5m 23s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 53s
	3h 0m 51s

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