Add gtl_button_cell to ServiceTemplateDecorator for valid/invalid Ser…

…vice

Issue: ManageIQ/manageiq-ui-classic#6320

app/decorators/service_template_decorator.rb

@@ -14,4 +14,14 @@ def fileicon
   def quadicon
     fileicon ? {:fileicon => fileicon} : {:fonticon => fonticon}
   end
+
+  def gtl_button_cell(row_id, label, title, function)
+    {
+      :is_button => true,
+      :text      => label,
+      :title     => template_valid? ? title : _("This Service cannot be ordered"),
+      :disabled  => !template_valid?,
+      :onclick   => "#{function}(\"#{row_id}\");"
+    }
+  end
 end