Stop showing stack trace as it is not helpful to LLM (#1012)

* Stop showing stack trace as it is not helpful to LLM

* update

Author: xiangyan99

core/src/AzureMcp.Core/Commands/BaseCommand.cs

@@ -44,7 +44,11 @@ protected virtual void HandleException(CommandContext context, Exception ex)
         var response = context.Response;
         var result = new ExceptionResult(
             Message: ex.Message,
+#if DEBUG
             StackTrace: ex.StackTrace,
+#else
+            StackTrace: null,
+#endif
             Type: ex.GetType().Name);
 
         response.Status = GetStatusCode(ex);