Tests

Prevent synthetic intersections from leaking to module public interfa… #19845

Job	Run time
Test mypyc suite with 32-bit Python	9m 10s
Test suite with py313-ubuntu, mypyc-compiled	13m 41s
Test suite with py314-ubuntu, mypyc-compiled	13m 34s
Test suite with py314t-ubuntu, mypyc-compiled	15m 43s
Test suite with py310-ubuntu, mypyc-compiled	14m 2s
Test suite with py311-ubuntu	9m 9s
Test suite with py312-ubuntu	9m 58s
mypyc runtime tests with py313-macos	4m 8s
Test suite with py314-windows-64	27m 38s
Type check our own code (py310-windows-64)	2m 19s
Formatting and code style with Black + ruff	1m 58s
mypyc runtime tests with py310-ubuntu	5m 18s
Type check our own code (py310-ubuntu)	1m 41s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 11s
Parallel tests with py314-ubuntu, interpreted	23m 12s
	2h 59m 42s

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