Tests

Fix crashing on invalid `Concatenate` usage #22443

Job	Run time
Test mypyc suite with 32-bit Python	10m 43s
Test suite with py314t-ubuntu, mypyc-compiled	18m 31s
Test suite with py310-ubuntu, mypyc-compiled	17m 20s
Test suite with py313-ubuntu, mypyc-compiled	16m 41s
Test suite with py315-ubuntu, mypyc-compiled	15m 52s
Test suite with py314-ubuntu, mypyc-compiled	16m 16s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 29s
Test suite with py314-windows-64	33m 59s
Test suite with py311-ubuntu	9m 50s
Type check our own code (py310-ubuntu)	1m 10s
Type check our own code (py310-windows-64)	1m 53s
mypyc runtime tests with py310-ubuntu	5m 34s
Parallel tests with py314-ubuntu, interpreted	25m 16s
mypyc runtime tests with py313-macos	6m 42s
Parallel tests with py314-windows-64, interpreted	14m 36s
Formatting and code style with Black + ruff	1m 39s
Test suite with py312-ubuntu	10m 23s
	3h 54m 54s

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