Merge and modify PR from @Kurnihil

Merging a PR from @Kurnihil into the already rebased branch.
Made some small changes to make it work with newer changes.

Some finetuning is probably still needed.

Co-authored-by: Daniele Andrei <daniele.andrei@geo-satis.com>
Co-authored-by: Kurnihil

src/api/core/organizations.rs

@@ -2382,7 +2382,7 @@ async fn add_update_group(
         "OrganizationId": group.organizations_uuid,
         "Name": group.name,
         "AccessAll": group.access_all,
-        "ExternalId": group.get_external_id()
+        "ExternalId": group.external_id
     })))
 }