Tests

Fix `--strict-equality` for iteratively visited code #19792

Job	Run time
Test mypyc suite with 32-bit Python	8m 30s
Test suite with py312-ubuntu	10m 1s
Test suite with py314-ubuntu, mypyc-compiled	14m 2s
Test suite with py311-ubuntu	9m 22s
Test suite with py310-ubuntu, mypyc-compiled	14m 26s
mypyc runtime tests with py310-ubuntu	5m 12s
mypyc runtime tests with py313-macos	7m 14s
Parallel tests with py314-ubuntu, mypyc-compiled	25m 10s
Test suite with py313-ubuntu, mypyc-compiled	13m 41s
Type check our own code (py310-ubuntu)	1m 37s
Parallel tests with py314-ubuntu, interpreted	21m 11s
Test suite with py314t-ubuntu, mypyc-compiled	16m 40s
Type check our own code (py310-windows-64)	3m 6s
Test suite with py314-windows-64	26m 53s
Formatting and code style with Black + ruff	1m 50s
	2h 58m 55s

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