Tests

Support narrowing literals and enums using the in operator in combination with list, set, and tuple expressions. #15805

Job	Run time
Test suite with py39-ubuntu, mypyc-compiled	15m 27s
Test mypyc suite with 32-bit Python	7m 51s
Test suite with py39-windows-64	22m 32s
Test suite with py310-ubuntu	11m 34s
Test suite with py311-ubuntu, mypyc-compiled	12m 55s
Test suite with py312-ubuntu, mypyc-compiled	14m 20s
Test suite with py313-ubuntu, mypyc-compiled	14m 32s
mypyc runtime tests with py39-macos	5m 0s
Type check our own code (py39-ubuntu)	2m 5s
Type check our own code (py39-windows-64)	2m 23s
Formatting and code style with Black + ruff	1m 42s
	1h 50m 21s

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