Tests

Make --show-traceback the default and add --no-show-traceback #22026

Job	Run time
Test mypyc suite with 32-bit Python	11m 10s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 17s
Test suite with py314-ubuntu, mypyc-compiled	15m 19s
mypyc runtime tests with py310-ubuntu	6m 56s
mypyc runtime tests with py313-macos	6m 36s
Test suite with py312-ubuntu	9m 26s
Test suite with py311-ubuntu	9m 48s
Test suite with py310-ubuntu, mypyc-compiled	16m 58s
Type check our own code (py310-ubuntu)	1m 11s
Type check our own code (py310-windows-64)	1m 55s
Parallel tests with py314-ubuntu, interpreted	26m 22s
Test suite with py314t-ubuntu, mypyc-compiled	18m 54s
Parallel tests with py314-windows-64, interpreted	15m 11s
Test suite with py314-windows-64	29m 5s
Test suite with py313-ubuntu, mypyc-compiled	15m 58s
Formatting and code style with Black + ruff	1m 56s
	3h 35m 2s

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