Tests

Merge error code lists into one page (Fixes #20077) #20078

Job	Run time
Test mypyc suite with 32-bit Python	9m 39s
mypyc runtime tests with py313-macos	6m 21s
Test suite with py313-ubuntu, mypyc-compiled	14m 31s
Test suite with py314-windows-64	22m 42s
Parallel tests with py314-ubuntu, mypyc-compiled	22m 48s
Test suite with py311-ubuntu	9m 10s
Type check our own code (py310-windows-64)	2m 23s
mypyc runtime tests with py310-ubuntu	5m 37s
Parallel tests with py314-ubuntu, interpreted	22m 48s
Type check our own code (py310-ubuntu)	1m 37s
Test suite with py312-ubuntu	10m 1s
Test suite with py314t-ubuntu, mypyc-compiled	16m 55s
Test suite with py314-ubuntu, mypyc-compiled	14m 26s
Test suite with py310-ubuntu, mypyc-compiled	15m 13s
Formatting and code style with Black + ruff	1m 59s
	2h 56m 10s

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