Tests

fix: optimize overloaded signatures check #19665

Job	Run time
Test mypyc suite with 32-bit Python	9m 24s
Test suite with py313-ubuntu, mypyc-compiled	13m 52s
Test suite with py310-ubuntu, mypyc-compiled	14m 0s
Test suite with py312-ubuntu	10m 2s
Test suite with py311-ubuntu	9m 17s
Test suite with py314-ubuntu, mypyc-compiled	14m 3s
Test suite with py314-windows-64	26m 41s
mypyc runtime tests with py310-ubuntu	5m 14s
Test suite with py314t-ubuntu, mypyc-compiled	16m 6s
Parallel tests with py314-ubuntu, interpreted	23m 26s
mypyc runtime tests with py313-macos	6m 13s
Type check our own code (py310-windows-64)	2m 25s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 33s
Formatting and code style with Black + ruff	2m 3s
Type check our own code (py310-ubuntu)	1m 38s
	3h 1m 57s

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