Implement signature cancellation feature

Added functionality to cancel signatures in workflow, including controller, view, and tests. Updated translations and adjusted templates to support and display cancellation actions.

src/Bundle/ChillMainBundle/Entity/Workflow/EntityWorkflowStepSignature.php

@@ -161,6 +161,16 @@ class EntityWorkflowStepSignature implements TrackCreationInterface, TrackUpdate
         return EntityWorkflowSignatureStateEnum::PENDING == $this->getState();
     }
 
+    public function isCanceled(): bool
+    {
+        return EntityWorkflowSignatureStateEnum::CANCELED === $this->getState();
+    }
+
+    public function isRejected(): bool
+    {
+        return EntityWorkflowSignatureStateEnum::REJECTED === $this->getState();
+    }
+
     /**
      * Checks whether all signatures associated with a given workflow step are not pending.
      *