Tests

Add test for Literal and enum incompatibility (#20613) #20230

Job	Run time
Test mypyc suite with 32-bit Python	9m 38s
Test suite with py310-ubuntu, mypyc-compiled	15m 13s
Test suite with py312-ubuntu	9m 52s
Test suite with py311-ubuntu	9m 35s
Test suite with py314t-ubuntu, mypyc-compiled	17m 7s
mypyc runtime tests with py310-ubuntu	5m 14s
Test suite with py313-ubuntu, mypyc-compiled	14m 55s
Test suite with py314-ubuntu, mypyc-compiled	15m 38s
Test suite with py314-windows-64	28m 20s
Type check our own code (py310-windows-64)	2m 11s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 55s
Formatting and code style with Black + ruff	1m 52s
Parallel tests with py314-ubuntu, interpreted	25m 57s
Type check our own code (py310-ubuntu)	1m 39s
mypyc runtime tests with py313-macos	5m 39s
	3h 10m 45s

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