Tests

Handle functools.Placeholder in partial #22115

Job	Run time
Test mypyc suite with 32-bit Python	10m 13s
Test suite with py310-ubuntu, mypyc-compiled	16m 28s
Test suite with py314-ubuntu, mypyc-compiled	15m 58s
Test suite with py312-ubuntu	10m 6s
mypyc runtime tests with py310-ubuntu	7m 5s
Parallel tests with py314-ubuntu, interpreted	26m 4s
Type check our own code (py310-windows-64)	1m 51s
Test suite with py314t-ubuntu, mypyc-compiled	17m 40s
Test suite with py314-windows-64	31m 40s
Test suite with py313-ubuntu, mypyc-compiled	15m 54s
Parallel tests with py314-windows-64, interpreted	10m 44s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 57s
Test suite with py311-ubuntu	9m 2s
Formatting and code style with Black + ruff	1m 43s
mypyc runtime tests with py313-macos	5m 38s
Type check our own code (py310-ubuntu)	1m 12s
	3h 29m 15s

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