Tests

Make `X[()]` count as a type application #20084

Job	Run time
Test mypyc suite with 32-bit Python	9m 37s
Test suite with py314t-ubuntu, mypyc-compiled	18m 3s
Test suite with py313-ubuntu, mypyc-compiled	15m 2s
Test suite with py311-ubuntu	9m 18s
Test suite with py312-ubuntu	9m 55s
Test suite with py314-ubuntu, mypyc-compiled	14m 56s
Test suite with py310-ubuntu, mypyc-compiled	15m 23s
Type check our own code (py310-windows-64)	2m 52s
mypyc runtime tests with py310-ubuntu	5m 52s
mypyc runtime tests with py313-macos	5m 23s
Type check our own code (py310-ubuntu)	1m 37s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 40s
Parallel tests with py314-ubuntu, interpreted	23m 36s
Formatting and code style with Black + ruff	1m 57s
Test suite with py314-windows-64	31m 50s
	3h 15m 1s

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