Tests

Add boilerplate for graph broadcasting (#20715) #20600

Job	Run time
Test mypyc suite with 32-bit Python	9m 25s
Test suite with py310-ubuntu, mypyc-compiled	15m 0s
Test suite with py312-ubuntu	8m 54s
Test suite with py313-ubuntu, mypyc-compiled	14m 16s
Test suite with py314t-ubuntu, mypyc-compiled	17m 28s
Test suite with py311-ubuntu	8m 43s
mypyc runtime tests with py310-ubuntu	5m 28s
Test suite with py314-ubuntu, mypyc-compiled	13m 33s
mypyc runtime tests with py313-macos	4m 29s
Type check our own code (py310-windows-64)	3m 0s
Parallel tests with py314-ubuntu, interpreted	24m 31s
Formatting and code style with Black + ruff	1m 49s
Type check our own code (py310-ubuntu)	1m 43s
Test suite with py314-windows-64	27m 47s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 29s
	3h 4m 35s

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