Tests

Remove --force-union-syntax flag #19751

Job	Run time
Test mypyc suite with 32-bit Python	9m 12s
mypyc runtime tests with py310-ubuntu	5m 22s
Test suite with py314-ubuntu, mypyc-compiled	14m 22s
Type check our own code (py310-ubuntu)	1m 40s
Parallel tests with py314-ubuntu, mypyc-compiled	25m 15s
mypyc runtime tests with py313-macos	5m 22s
Type check our own code (py310-windows-64)	2m 18s
Test suite with py313-ubuntu, mypyc-compiled	13m 52s
Test suite with py311-ubuntu	8m 46s
Formatting and code style with Black + ruff	1m 51s
Test suite with py312-ubuntu	10m 8s
Test suite with py310-ubuntu, mypyc-compiled	13m 55s
Test suite with py314t-ubuntu, mypyc-compiled	15m 49s
Test suite with py314-windows-64	26m 22s
Parallel tests with py314-ubuntu, interpreted	23m 12s
	2h 57m 26s

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