Tests

Make `X[()]` count as a type application #20083

Job	Run time
Test mypyc suite with 32-bit Python	9m 43s
Test suite with py313-ubuntu, mypyc-compiled	14m 19s
Test suite with py314-ubuntu, mypyc-compiled	14m 49s
Test suite with py312-ubuntu	10m 31s
Test suite with py314t-ubuntu, mypyc-compiled	17m 5s
mypyc runtime tests with py313-macos	6m 29s
Test suite with py311-ubuntu	8m 59s
mypyc runtime tests with py310-ubuntu	5m 47s
Test suite with py314-windows-64	19m 11s
Parallel tests with py314-ubuntu, interpreted	19m 17s
Formatting and code style with Black + ruff	2m 8s
Type check our own code (py310-ubuntu)	1m 53s
Test suite with py310-ubuntu, mypyc-compiled	15m 28s
Type check our own code (py310-windows-64)	2m 40s
Parallel tests with py314-ubuntu, mypyc-compiled	19m 17s
	2h 47m 36s

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