There could be more than one Entity reference for external sources

[paulo-graca]

https://github.com/DSpace/Rest7Contract/blob/master/external-authority-sources.md

     },
        "type": "externalSourceEntry",
        "_links": {
          "entity": {
            "href": "https://dspace7.4science.cloud/server/api/core/item/6fd90bf5-b84f-47b3-aaec-a55bde3a2a5a"
          },
          "self": {
            "href": "https://dspace7.4science.cloud/server/api/integration/externalsources/orcid/entryValues/0000-0003-3681-2038"
          }
        }
      }

which regards the entity reference in the example above, there are cases where can exist more than one. By default It should be an array. Example:

"_links": {
          "entity": [{
            "href": "https://dspace7.4science.cloud/server/api/core/item/6fd90bf5-b84f-47b3-aaec-a55bde3a2a5a"
          }],

[tdonohue]

I'm not sure how to move this forward, as I don't see this entity link anywhere in our codebase at https://github.com/DSpace/DSpace. I think the documentation may be incorrect, as I only see a self link in responses from this endpoint (including when I try the demo site, e.g. https://dspace7.4science.cloud/server/#https://dspace7.4science.cloud/server/api/integration/externalsources/pubmed/entryValues/33027802)

Therefore, I think this likely should be closed and the contract updated to remove the entity link.

@benbosman : as I believe you added this code, am I missing something here?