Tests

Avoid widening types in conditional_types #21753

Job	Run time
Test mypyc suite with 32-bit Python	11m 2s
Test suite with py310-ubuntu, mypyc-compiled	16m 2s
Test suite with py312-ubuntu	9m 20s
Test suite with py314-ubuntu, mypyc-compiled	15m 55s
Test suite with py313-ubuntu, mypyc-compiled	16m 17s
Test suite with py314t-ubuntu, mypyc-compiled	17m 21s
Test suite with py311-ubuntu	9m 16s
Parallel tests with py314-windows-64, interpreted	9m 11s
Formatting and code style with Black + ruff	1m 46s
Parallel tests with py314-ubuntu, interpreted	24m 49s
Type check our own code (py310-ubuntu)	1m 14s
mypyc runtime tests with py310-ubuntu	6m 35s
mypyc runtime tests with py313-macos	4m 59s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 21s
Type check our own code (py310-windows-64)	2m 15s
Test suite with py314-windows-64	28m 33s
	3h 23m 56s

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