Tests

Fix nested Concatenate with ellipsis crash #22175

Job	Run time
Test mypyc suite with 32-bit Python	11m 9s
Test suite with py310-ubuntu, mypyc-compiled	1m 37s
Test suite with py314t-ubuntu, mypyc-compiled	1m 42s
Test suite with py311-ubuntu	9m 33s
Test suite with py314-ubuntu, mypyc-compiled	1m 20s
Test suite with py312-ubuntu	10m 11s
Parallel tests with py314-ubuntu, mypyc-compiled	1m 19s
Parallel tests with py314-windows-64, interpreted	11m 57s
Parallel tests with py314-ubuntu, interpreted	26m 31s
Formatting and code style with Black + ruff	1m 55s
Test suite with py314-windows-64	32m 42s
Type check our own code (py310-ubuntu)	1m 1s
mypyc runtime tests with py313-macos	5m 0s
Type check our own code (py310-windows-64)	1m 51s
mypyc runtime tests with py310-ubuntu	6m 54s
Test suite with py313-ubuntu, mypyc-compiled	1m 13s
	2h 5m 55s

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