[8.11](backport #38094) Memory queue: cancel in-progress writes on queue closed, not producer closed #38279
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… closed (#38094) Fixes a race condition that could lead to incorrect event totals and occasional panics #37702. Once a producer sends a get request to the memory queue, it must wait on the response unless the queue itself is closed, otherwise it can return a false failure. The previous code mistakenly waited on the done signal for the current producer rather than the queue. This PR adds the queue's done signal to the producer struct, and waits on that once the insert request is sent. (cherry picked from commit d23b4d3)
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