Tests

Enable --pretty by default for better error messages #20891

Job	Run time
Test mypyc suite with 32-bit Python	9m 24s
Test suite with py314t-ubuntu, mypyc-compiled	16m 27s
Test suite with py314-ubuntu, mypyc-compiled	14m 31s
Test suite with py312-ubuntu	8m 50s
Test suite with py313-ubuntu, mypyc-compiled	14m 3s
mypyc runtime tests with py310-ubuntu	5m 35s
mypyc runtime tests with py313-macos	8m 9s
Type check our own code (py310-windows-64)	2m 22s
Test suite with py311-ubuntu	9m 4s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 32s
Formatting and code style with Black + ruff	1m 44s
Parallel tests with py314-windows-64, interpreted	10m 28s
Parallel tests with py314-ubuntu, interpreted	22m 52s
Type check our own code (py310-ubuntu)	1m 41s
Test suite with py314-windows-64	27m 16s
Test suite with py310-ubuntu, mypyc-compiled	15m 15s
	3h 17m 13s

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