Tests

Remove --force-union-syntax flag (#20405) #19752

Job	Run time
Test mypyc suite with 32-bit Python	9m 10s
Test suite with py311-ubuntu	8m 55s
Test suite with py312-ubuntu	9m 44s
Test suite with py313-ubuntu, mypyc-compiled	14m 9s
Parallel tests with py314-ubuntu, mypyc-compiled	26m 3s
Type check our own code (py310-ubuntu)	1m 42s
Test suite with py310-ubuntu, mypyc-compiled	14m 1s
Test suite with py314t-ubuntu, mypyc-compiled	15m 39s
mypyc runtime tests with py313-macos	6m 38s
Type check our own code (py310-windows-64)	2m 15s
Formatting and code style with Black + ruff	2m 0s
mypyc runtime tests with py310-ubuntu	4m 47s
Test suite with py314-ubuntu, mypyc-compiled	14m 9s
Parallel tests with py314-ubuntu, interpreted	22m 17s
Test suite with py314-windows-64	27m 47s
	2h 59m 16s

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