Tests

Make `X[()]` count as a type application (#20568) #20085

Job	Run time
Test mypyc suite with 32-bit Python	9m 34s
Test suite with py313-ubuntu, mypyc-compiled	14m 40s
Test suite with py310-ubuntu, mypyc-compiled	15m 1s
Parallel tests with py314-ubuntu, mypyc-compiled	26m 34s
Test suite with py314-windows-64	28m 31s
Test suite with py312-ubuntu	10m 5s
Type check our own code (py310-windows-64)	2m 47s
Formatting and code style with Black + ruff	2m 13s
Test suite with py314t-ubuntu, mypyc-compiled	17m 38s
Test suite with py314-ubuntu, mypyc-compiled	15m 1s
mypyc runtime tests with py310-ubuntu	5m 40s
Parallel tests with py314-ubuntu, interpreted	23m 21s
Type check our own code (py310-ubuntu)	1m 45s
Test suite with py311-ubuntu	9m 22s
mypyc runtime tests with py313-macos	6m 14s
	3h 8m 26s

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