Tests

Remove special case for Union type context #20204

Job	Run time
Test mypyc suite with 32-bit Python	1m 34s
Test suite with py311-ubuntu	1m 43s
Test suite with py310-ubuntu, mypyc-compiled	1m 42s
Test suite with py312-ubuntu	1m 43s
Test suite with py314t-ubuntu, mypyc-compiled	1m 43s
Test suite with py314-ubuntu, mypyc-compiled	1m 43s
Parallel tests with py314-ubuntu, interpreted	1m 45s
Test suite with py314-windows-64	1m 37s
Type check our own code (py310-ubuntu)	1m 43s
Parallel tests with py314-ubuntu, mypyc-compiled	1m 43s
Formatting and code style with Black + ruff	1m 47s
Test suite with py313-ubuntu, mypyc-compiled	1m 43s
Type check our own code (py310-windows-64)	1m 40s
mypyc runtime tests with py310-ubuntu	1m 47s
mypyc runtime tests with py313-macos	1m 49s
	25m 42s

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