Python: Add some test cases for flow involving global and captured variables #18037
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Adds test cases for cases involving flow through global variables and captured variables.
This checks whether modelling stdlib
queue.Queueas a container would allow for the use case of dataflow between access of a sharedQueueacross separate threads, which is necessary for covering CVE-2024-32651. As-is it appears that such modelling would not be sufficient to detect flow in this case.