Tests

Fix `--strict-equality` for iteratively visited code #19627

Job	Run time
Test mypyc suite with 32-bit Python	8m 54s
Test suite with py314-ubuntu, mypyc-compiled	15m 4s
Test suite with py310-ubuntu, mypyc-compiled	14m 21s
Test suite with py312-ubuntu	9m 48s
mypyc runtime tests with py313-macos	6m 37s
mypyc runtime tests with py310-ubuntu	5m 2s
Test suite with py314-windows-64	25m 37s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 32s
Test suite with py313-ubuntu, mypyc-compiled	14m 9s
Type check our own code (py310-ubuntu)	1m 33s
Parallel tests with py314-ubuntu, interpreted	23m 19s
Type check our own code (py310-windows-64)	2m 27s
Formatting and code style with Black + ruff	1m 59s
Test suite with py311-ubuntu	9m 12s
	2h 46m 34s

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