Tests

(minor) Small simplifications in combine_function_signatures (#19196) #22224

Job	Run time
Test mypyc suite with 32-bit Python	10m 37s
Test suite with py310-ubuntu, mypyc-compiled	16m 50s
Test suite with py314-ubuntu, mypyc-compiled	16m 6s
Test suite with py315-ubuntu, mypyc-compiled	15m 19s
mypyc runtime tests with py313-macos	8m 24s
Test suite with py313-ubuntu, mypyc-compiled	16m 28s
mypyc runtime tests with py310-ubuntu	7m 10s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 46s
Parallel tests with py314-ubuntu, interpreted	25m 11s
Parallel tests with py314-windows-64, interpreted	10m 21s
Test suite with py314-windows-64	30m 28s
Test suite with py312-ubuntu	9m 52s
Test suite with py311-ubuntu	9m 23s
Type check our own code (py310-ubuntu)	1m 9s
Test suite with py314t-ubuntu, mypyc-compiled	17m 54s
Formatting and code style with Black + ruff	1m 55s
Type check our own code (py310-windows-64)	1m 58s
	3h 46m 51s

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