CopyCollectionItems: Copy artifact relations where possible

Colin Watsonrequested to merge
cjwatson/debusine:copy-artifact-relations into devel

The immediate need for this is to make sure that the copied debian:debug-symbols artifacts have the necessary relations to their corresponding debian:binary-package artifacts, but it makes sense for other artifact categories too.

Fixes: #1543 (closed)

Edited by Colin Watson

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