[Messages] Ignore confirmations in capped collection #252
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Fixed an issue where the message processing job would fail while
writing a confirmation to the capped messages collection.
In MongoDB, it is not possible to increase the size of a document
in a capped collection. As this particular collection is only used
for the websockets to advertise new messages, we now simply
ignore the confirmation for this collection.
Added a unit test to test the confirmation flow.