Improve variable resolution in workflow activity

Added a reference to Variable.Id in the SetVariable activity within the Elsa.Workflows.Core module to ensure the correct variable scope is utilized. This change enhances the precision of the variable resolution process by ensuring the correct variable is identified and updated.

src/modules/Elsa.Workflows.Core/Activities/SetVariable.cs

@@ -5,6 +5,7 @@
 using Elsa.Workflows.Attributes;
 using Elsa.Workflows.Memory;
 using Elsa.Workflows.Models;
+using Elsa.Workflows.UIHints;
 using JetBrains.Annotations;
 
 namespace Elsa.Workflows.Activities;
@@ -100,7 +101,10 @@ public SetVariable([CallerFilePath] string? source = default, [CallerLineNumber]
  /// <inheritdoc />
  protected override void Execute(ActivityExecutionContext context)
  {
+ // Always refer to the variable by ID to ensure that the variable is resolved from the correct scope.
+ var variableId = Variable.Id; 
+ var variable = context.ExpressionExecutionContext.EnumerateVariablesInScope().FirstOrDefault(x => x.Id == variableId);
  var value = context.Get(Value);
- context.SetVariable(Variable.Name, value);
+ variable?.Set(context, value);
  }
 }