Tests

Remove special case for Union type context #20205

Job	Run time
Test mypyc suite with 32-bit Python	9m 31s
Test suite with py313-ubuntu, mypyc-compiled	14m 52s
Test suite with py310-ubuntu, mypyc-compiled	15m 15s
Test suite with py311-ubuntu	9m 21s
Test suite with py312-ubuntu	9m 41s
Test suite with py314-windows-64	26m 40s
Test suite with py314t-ubuntu, mypyc-compiled	17m 29s
mypyc runtime tests with py310-ubuntu	5m 31s
Parallel tests with py314-ubuntu, interpreted	24m 32s
Test suite with py314-ubuntu, mypyc-compiled	14m 41s
Formatting and code style with Black + ruff	1m 57s
mypyc runtime tests with py313-macos	6m 0s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 59s
Type check our own code (py310-windows-64)	2m 50s
Type check our own code (py310-ubuntu)	1m 42s
	3h 9m 1s

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