Refs #23232. Avoid generating detail namespace for interfaces without output arguments.

Signed-off-by: Miguel Company <miguelcompany@eprosima.com>

Author: MiguelCompany

src/main/java/com/eprosima/fastcdr/idl/templates/TypesHeader.stg

@@ -190,10 +190,12 @@ private:
 
 interface(ctx, parent, interface, export_list) ::= <<
 
+$if(interface.withOutputParameters)$
 namespace detail {
 
 $interface.operations : { op | $if(op.outputparam)$$operation_out_struct_fwd_decl(interface, op)$$endif$}$
-}
+}  // namespace detail
+$endif$
 
 /*!
  * @brief This class represents the interface $interface.name$ defined by the user in the IDL file.
@@ -207,10 +209,12 @@ public:
     $export_list$
 };
 
+$if(interface.withOutputParameters)$
 namespace detail {
 
 $interface.operations : { op | $if(op.outputparam)$$operation_out_struct(interface, op)$$"\n"$$endif$}$
-}
+}  // namespace detail
+$endif$
 >>
 
 operation(ctx, parent, operation, param_list, operation_type) ::= <<

src/main/java/com/eprosima/fastdds/idl/grammar/Interface.java

@@ -43,6 +43,11 @@ public void add(com.eprosima.idl.parser.tree.Export exp)
                 m_hasOutputFeeds = true;
             }
 
+            if (op.getOutputparam().size() > 0)
+            {
+                m_has_operations_with_output_arguments = true;
+            }
+
             m_context.operationAdded(op);
         }
     }
@@ -57,6 +62,18 @@ public boolean isWithOutputFeeds()
         return m_hasOutputFeeds;
     }
 
+    /*!
+     * @ingroup api_for_stg
+     *
+     * @brief This function is used to check if the interface has operations output arguments.
+     *
+     * @return True if the interface has operations with output arguments, false otherwise.
+     */
+    public boolean isWithOutputParameters()
+    {
+        return m_has_operations_with_output_arguments;
+    }
+
     /*!
      * @brief This function is used in stringtemplates to generate the typesupport code for the interface.
      *
@@ -161,6 +178,7 @@ private EnumTypeCode get_remoteExceptionCode_t_type()
 
     private Context m_context = null;
     private boolean m_hasOutputFeeds = false;
+    private boolean m_has_operations_with_output_arguments = false;
     private StructTypeCode m_request_type = null;
     private StructTypeCode m_reply_type = null;
     static private EnumTypeCode m_remoteExceptionCode_t_type = null;