fix: Count exception occurs when searching conversations (#8754)

Co-authored-by: zheng.gao <zheng.gao@amh-group.com>

api/controllers/console/app/conversation.py

@@ -188,6 +188,7 @@ class ChatConversationApi(Resource):
                         subquery.c.from_end_user_session_id.ilike(keyword_filter),
                     ),
                 )
+                .group_by(Conversation.id)
             )
 
         account = current_user