Integrate DuplicateEntityWorkflowFinder to prevent creating workflows for entities with existing opened or positive final workflows. Updated EntityWorkflowVoter to implement the same check before allowing creation. Removed unnecessary blank workflow parameter from Twig template.
Implemented OpenedEntityWorkflowHelper to handle final state checks for EntityWorkflow. This includes methods to determine if a workflow has reached positive or negative final steps. Added corresponding unit tests to ensure proper functionality.