Refactor ExpressionExecutionContextExtensions module

Modified the GetInput methods to consider the case where the method is called within a composite activity, ensuring that only local variables have precedence over workflow input when executing within a composite activity.

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

@@ -319,37 +319,39 @@ public static IEnumerable<Variable> EnumerateVariablesInScope(this ExpressionExe
     /// <summary>
     /// Returns the value of the specified input.
     /// </summary>
-    /// <param name="expressionExecutionContext"></param>
+    /// <param name="context"></param>
     /// <param name="name">The name of the input.</param>
     /// <typeparam name="T">The type of the input.</typeparam>
     /// <returns>The value of the specified input.</returns>
-    public static T? GetInput<T>(this ExpressionExecutionContext expressionExecutionContext, string name)
+    public static T? GetInput<T>(this ExpressionExecutionContext context, string name)
     {
-        var value = expressionExecutionContext.GetInput(name);
+        var value = context.GetInput(name);
         return value.ConvertTo<T>();
     }
 
     /// <summary>
     /// Returns the value of the specified input.
     /// </summary>
-    /// <param name="expressionExecutionContext"></param>
+    /// <param name="context"></param>
     /// <param name="name">The name of the input.</param>
     /// <returns>The value of the specified input.</returns>
-    public static object? GetInput(this ExpressionExecutionContext expressionExecutionContext, string name)
+    public static object? GetInput(this ExpressionExecutionContext context, string name)
     {
-        // If there's a variable in the current scope with the specified name, return that.
-        var variable = expressionExecutionContext.GetVariable(name);
+        if (context.IsInsideCompositeActivity())
+        {
+            // If there's a variable in the current scope with the specified name, return that.
+            var variable = context.GetVariable(name);
 
-        if (variable != null)
-            return variable.Get(expressionExecutionContext);
+            if (variable != null)
+                return variable.Get(context);
+        }
 
         // Otherwise, return the input.
-        var workflowExecutionContext = expressionExecutionContext.GetWorkflowExecutionContext();
+        var workflowExecutionContext = context.GetWorkflowExecutionContext();
         var input = workflowExecutionContext.Input;
         return input.TryGetValue(name, out var value) ? value : default;
     }
-
-
+
     /// <summary>
     /// Returns the value of the specified input.
     /// </summary>