feat: Improve connection removal handling by skipping connections not managed by the controller

            mapping = self._object_cache.get(CachedEntities.CONNECTION, connection_uuid, auto_retrieve=False)

            if mapping is None:

                MSG = 'Connection {:s} not found in cache, cannot process removal (service may have restarted)'

                raise Exception(MSG.format(connection_uuid))

                MSG = 'Connection {:s} not managed by this controller (not in allowed links), skipping removal'

                LOGGER.debug(MSG.format(connection_uuid))

                return

            # Defensive: distinguish mapping dicts from potential protobuf Connection objects

            if not isinstance(mapping, dict) or 'domain' not in mapping or 'links' not in mapping: