Create duplicate concepts or provide thesauri health checks?

[johnatawnclementawn]

The current Arches RDM allows for concepts to participate in multiple thesauri. However, after #123, the Lingo models will only support 1-1 relationships between Concepts and Schemes. This poses an issue for how to handle concepts that participate in multiple thesauri being migrated from the RDM to Arches-Lingo. In Arches-References, if a concept participates in multiple collections in the RDM, we create a distinct list item from a given concept for each collection (now List). It should be decided whether we follow this same tactic and create duplicate concept resources or whether we should provide a 'health checking' mechanism for Arches Administrators to identify concepts that participate in multiple thesauri and adjust those relationships before migrating their thesauri to Lingo.

[jacobtylerwalls]

If we go with health checking, let's reuse/extend the core arches manage.py validate command?