Add workflow result variable to context scope

In the ExpressionExecutionContextExtensions module, an additional check and yield operation has been implemented. This allows the inclusion of the workflow result variable, if it exists, to the current context scope.

src/modules/Elsa.Workflows.Core/Extensions/ExpressionExecutionContextExtensions.cs

@@ -314,6 +314,12 @@ public static IEnumerable<Variable> EnumerateVariablesInScope(this ExpressionExe
 
             currentScope = currentScope.ParentContext;
         }
+
+        if (context.TryGetWorkflowExecutionContext(out var workflowExecutionContext))
+        {
+            if (workflowExecutionContext.Workflow.ResultVariable != null)
+                yield return workflowExecutionContext.Workflow.ResultVariable;
+        }
     }
 
     /// <summary>