Tests

Refactor equality and identity narrowing for clarity (#20595) #20163

Job	Run time
Test mypyc suite with 32-bit Python	9m 50s
Test suite with py310-ubuntu, mypyc-compiled	15m 11s
Test suite with py312-ubuntu	10m 5s
Test suite with py314-ubuntu, mypyc-compiled	14m 37s
Test suite with py313-ubuntu, mypyc-compiled	15m 5s
Formatting and code style with Black + ruff	2m 2s
mypyc runtime tests with py310-ubuntu	5m 50s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 9s
Parallel tests with py314-ubuntu, interpreted	23m 35s
Type check our own code (py310-ubuntu)	1m 40s
Test suite with py311-ubuntu	9m 12s
Test suite with py314t-ubuntu, mypyc-compiled	17m 6s
mypyc runtime tests with py313-macos	4m 41s
Type check our own code (py310-windows-64)	3m 29s
Test suite with py314-windows-64	27m 37s
	3h 8m 9s

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