copying a tag does not preserve its pulp_user_metadata
As a user, if I copy a tag from one repo to another, I expect its pulp_user_metadata to be copied as well.
I believe that is what happens when other units that have repo_id in the unit key fields are being copied (i.e. package_group).
The code in the yum importer for copying groups and other metadata-only units:
The code in pulp_docker for copying tags:
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