Tests

Fix `--strict-equality` for iteratively visited code #19362

Job	Run time
Test mypyc suite with 32-bit Python	7m 15s
Test suite with py39-ubuntu, mypyc-compiled	1m 15s
Test suite with py313-ubuntu, mypyc-compiled	1m 0s
Test suite with py311-ubuntu	7m 13s
Test suite with py310-ubuntu	7m 14s
mypyc runtime tests with py313-macos	5m 1s
Test suite with py314-ubuntu, mypyc-compiled	1m 2s
mypyc runtime tests with py310-ubuntu	4m 40s
Test suite with py312-ubuntu, mypyc-compiled	1m 2s
Test suite with py314-windows-64	7m 10s
Formatting and code style with Black + ruff	1m 56s
Type check our own code (py39-ubuntu)	1m 36s
Type check our own code (py39-windows-64)	2m 28s
	48m 52s

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