fix(agent): IGNGPF-4398 improve consistency

Closes IGNGPF-4398

gpf_agent_vector_tms/agent_vector_tms.py

@@ -169,6 +169,18 @@ class VectorTMSAgent(PublishAgent):
         except Exception as e:
             raise Exception(f"is_offering_published : {e}")
 
+    def get_published_offerings(self) -> list[str]:
+        """Fonction qui récupère la liste des offres publiées sur le serveur.
+
+        Returns:
+            List[str]: La liste des offres publiées.
+        """
+        url = f"{self.geoservice_url}/index.json"
+        resp = requests.get(url)
+        infos = json.loads(resp.content.decode("UTF-8"))
+
+        return [sluggy(val["schema"]) for val in infos.values()]
+
     def init_pgdatabase(self, storage_type_infos: dict) -> PgDatabase:
         port: str = (
             storage_type_infos["port_read_only"]