Duplicated permission checks in Empty All Queues

ProcessGroupResource.authorizeHandleDropAllFlowFilesRequest() checks the permissions for the Empty All Queues feature.
It is traversing over the process group hierarchy to check all the connections in the sub process groups.
Traversing seems to be not needed because getEncapsulatedConnections() returns all the connections in the hierarchy so the permissions can be checked the parent group level. Traversing + getEncapsulatedConnections() leads to duplicated permission checks for connections in the children process groups.