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Deduplicate ChangesetEvents per Changeset before DB insert

Administrator requested to merge campaigns/deduplicate-changeset-events into master

Created by: mrnugget

This fixes #10264 by deduplicating the events per changeset before trying to insert them into the database.

Our unique-index on changsetID-kind-key ensures that we can update the same changeset event if we try to insert it a second time, but it breaks if we try to insert the same combination in the same query.

Since we shouldn't (see ticket!) have changesetevents with duplicate Kind+Key+ChangesetID in the first place, it's okay to drop them if we have them.

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