Tests

Rework narrowing logic for equality and identity #19895

Job	Run time
Test mypyc suite with 32-bit Python	7m 30s
Test suite with py314-ubuntu, mypyc-compiled	1m 11s
Test suite with py313-ubuntu, mypyc-compiled	1m 7s
Test suite with py311-ubuntu	7m 27s
Test suite with py310-ubuntu, mypyc-compiled	1m 16s
Test suite with py314t-ubuntu, mypyc-compiled	1m 21s
mypyc runtime tests with py313-macos	6m 16s
mypyc runtime tests with py310-ubuntu	5m 11s
Type check our own code (py310-windows-64)	2m 43s
Test suite with py314-windows-64	7m 23s
Parallel tests with py314-ubuntu, mypyc-compiled	1m 3s
Parallel tests with py314-ubuntu, interpreted	7m 28s
Type check our own code (py310-ubuntu)	1m 33s
Test suite with py312-ubuntu	7m 27s
Formatting and code style with Black + ruff	1m 55s
	1h 0m 51s

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