Tests

Fix nested Concatenate with ellipsis crash #22160

Job	Run time
Test mypyc suite with 32-bit Python	12m 9s
Test suite with py310-ubuntu, mypyc-compiled	16m 29s
Test suite with py314-ubuntu, mypyc-compiled	15m 54s
Test suite with py311-ubuntu	9m 29s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 31s
Test suite with py312-ubuntu	10m 15s
mypyc runtime tests with py313-macos	6m 48s
Type check our own code (py310-windows-64)	1m 49s
Test suite with py313-ubuntu, mypyc-compiled	16m 28s
Test suite with py314-windows-64	30m 41s
Parallel tests with py314-windows-64, interpreted	11m 37s
mypyc runtime tests with py310-ubuntu	6m 55s
Parallel tests with py314-ubuntu, interpreted	24m 16s
Test suite with py314t-ubuntu, mypyc-compiled	17m 25s
Formatting and code style with Black + ruff	1m 45s
Type check our own code (py310-ubuntu)	1m 10s
	3h 32m 41s

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