Remove duplicated log key

What does this MR do?

Currently we have a lookup_paths.lookup_paths[] entry in logs. This commit removes this duplication to be only lookup_paths[].

• before

{
  "error": null,
  "lookup_error": null,
  "lookup_name": "root.pages.gdk.test",
  "lookup_paths": {
    "lookup_paths": [
      {
        "prefix": "/html/",
        "project_id": 9,
        "source": {
          "file_count": 7,
          "file_size": 2170,
          "path": "http://127.0.0.1:9000/pages/19/58/19581e27de7ced00ff1ce50b2047e7a567c76b1cbaebabe5ef03f7c3017bb5b7/pages_deployments/4/artifacts.zip?X-Amz-Expires=86400&X-Amz-Date=20230413T205604Z&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=minio%2F20230413%2Fgdk%2Fs3%2Faws4_request&X-Amz-SignedHeaders=host&X-Amz-Signature=ab55feed3f4c3c654b4f919c72f66c127279b919b1b8cc2316e802845daa34b8",
          "sha256": "ed51ae0543f238188a97392b60268b72afee4104a94c7eeb57008b0f66517d54",
          "type": "zip"
        },
        "unique_host": "html-root-729ab4e008401717e9f530d3fae94e116490c064c46a26ad5d0e1.pages.gdk.test"
      }
    ]
  },
  "msg": "retrieval response sent",
  "requested_domain": "root.pages.gdk.test"
}

• after

{
  "error": null,
  "lookup_error": null,
  "lookup_name": "root.pages.gdk.test",
  "lookup_paths": [
    {
      "prefix": "/html/",
      "project_id": 9,
      "source": {
        "file_count": 7,
        "file_size": 2170,
        "path": "http://127.0.0.1:9000/pages/19/58/19581e27de7ced00ff1ce50b2047e7a567c76b1cbaebabe5ef03f7c3017bb5b7/pages_deployments/4/artifacts.zip?X-Amz-Expires=86400&X-Amz-Date=20230413T204402Z&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=minio%2F20230413%2Fgdk%2Fs3%2Faws4_request&X-Amz-SignedHeaders=host&X-Amz-Signature=944c15ef2f1ce4938f3aaebebb586013ac9bc98b5282c023eb0497243cbc36eb",
        "sha256": "ed51ae0543f238188a97392b60268b72afee4104a94c7eeb57008b0f66517d54",
        "type": "zip"
      },
      "unique_host": "html-root-729ab4e008401717e9f530d3fae94e116490c064c46a26ad5d0e1.pages.gdk.test"
    }
  ],
  "msg": "retrieval response sent",
  "requested_domain": "root.pages.gdk.test"
}

TODO

• Feature flag
  • Added feature flag:
  • This feature does not require a feature flag
• I added the Changelog trailer to the commits that need to be included in the changelog (e.g. Changelog: added)
• I added unit tests or they are not required
• I added acceptance tests or they are not required
• I added documentation (or it's not required)
• I followed code review guidelines
• I followed Go Style guidelines