Update ActivityStreams 'object' id to be a URI

[benosteen]

Further to #10665 - property name should by "id" instead of "url"

Unfortunately the value for this property was also changed as part of this issue, which was not correct. It should still be a full URI linking to the representation of the resource in Arches (eg http://localhost:8000/resources/09b97612-6abd-44fb-ba3d-8fb06c20f203)

• The URI should be valid, and resolvable.
• The URI should contain the FQDN for the service when the instance is deployed and publicly accessible.
• it should point to the JSON-LD /resources/ export view of the resource.

For example, the object from an Update activity from a service at https://archives.dev.getty.fargeo.com/ should look something like the following:

... 
      "object": {
        "type": "http://www.cidoc-crm.org/cidoc-crm/E22_Human-Made_Object",
        "id": "https://archives.dev.getty.fargeo.com/resources/09b97612-6abd-44fb-ba3d-8fb06c20f203"
      }
...