Fix: Add default serialization attributes for agents

[muhammedBkf]

Added default serialization attributes for Agents model to show the creator only if the display parameter is put to all.

• get /agents

[
  {
    "name": "TEST",
    "agentType": "person",
    "acronym": null,
    "email": null,
    "homepage": null,
    "identifiers": [
      {
        "notation": "0000-0002-3452-553X",
        "schemaAgency": "ORCID"
      }
    ],
    "affiliations": [],
    "@id": "http://0.0.0.0:9393/Agents/e8f7ea40-cae2-013d-4f89-0242ac130007",
    "@type": "http://xmlns.com/foaf/0.1/Agent",
    "@context": {
      "@vocab": "http://data.bioontology.org/metadata/",
      "agentType": "http://data.bioontology.org/metadata/agentType",
      "name": "http://xmlns.com/foaf/0.1/name",
      "homepage": "http://xmlns.com/foaf/0.1/homepage",
      "acronym": "http://www.w3.org/2004/02/skos/core#altLabel",
      "email": "http://xmlns.com/foaf/0.1/mbox",
      "identifiers": "http://www.w3.org/ns/adms#identifier",
      "affiliations": "http://www.w3.org/ns/org#memberOf",
      "@language": "en"
    }
  }
]

• get /agents?display=all

[
  {
    "id": "http://0.0.0.0:9393/Agents/e8f7ea40-cae2-013d-4f89-0242ac130007",
    "name": "TEST",
    "identifiers": [
      {
        "notation": "0000-0002-3452-553X",
        "schemaAgency": "ORCID"
      }
    ],
    "creator": "http://0.0.0.0:9393/users/admin",
    "agentType": "person",
    "homepage": null,
    "acronym": null,
    "email": null,
    "affiliations": [],
    "usages": {},
    "@id": "http://0.0.0.0:9393/Agents/e8f7ea40-cae2-013d-4f89-0242ac130007",
    "@type": "http://xmlns.com/foaf/0.1/Agent",
    "@context": {
      "@vocab": "http://data.bioontology.org/metadata/",
      "agentType": "http://data.bioontology.org/metadata/agentType",
      "name": "http://xmlns.com/foaf/0.1/name",
      "homepage": "http://xmlns.com/foaf/0.1/homepage",
      "acronym": "http://www.w3.org/2004/02/skos/core#altLabel",
      "email": "http://xmlns.com/foaf/0.1/mbox",
      "identifiers": "http://www.w3.org/ns/adms#identifier",
      "affiliations": "http://www.w3.org/ns/org#memberOf",
      "creator": {
        "@id": "http://data.bioontology.org/metadata/User",
        "@type": "@id"
      },
      "@language": "en"
    }
  }
]

[syphax-bouazzouni]

This change made the API tests fail https://github.com/ontoportal-lirmm/ontologies_api/actions/runs/13321974181/job/37208138514?pr=119
as we expect to have the id and affiliations by default as serialized by default, this change breaks also the UI agents features as they expect to the id and affiliations.
I reverted this change here #193.

@muhammedBkf you can open it again, and the required changes in the API and UI, so that we can merge them all in the same time.