Refactor: Update event retrieval to return distinct events (#1197)

- Modified the return statement in the EventStore class to ensure that the events returned are distinct, improving data integrity and reducing duplicates in the event list.

src/api/store/event.py

@@ -901,7 +901,7 @@ def list_events_for_community_admin(self, context: Context, args) -> Tuple[list,
 
             all_events = events | shared
 
-            return all_events, None
+            return all_events.distinct(), None
         except Exception as e:
             log.exception(e)
             return None, CustomMassenergizeError(e)