Don't allow adding another svc bundle into an existing bundle

https://bugzilla.redhat.com/show_bug.cgi?id=1671522

app/controllers/catalog_controller.rb

@@ -1464,7 +1464,7 @@ def rearrange_groups_array
 
   def get_available_resources(kls)
     @edit[:new][:available_resources] = {}
-    Rbac.filtered(kls.constantize.public_service_templates.where("type is null or type != 'ServiceTemplateAnsiblePlaybook'")).select(:id, :name).each do |r|
+    Rbac.filtered(kls.constantize.public_service_templates.where("(type is null or type != 'ServiceTemplateAnsiblePlaybook') and service_type != 'composite'")).select(:id, :name).each do |r|
       # don't add the servicetemplate record that's being edited, or add all vm templates
       if r.id.to_s != @edit[:rec_id].to_s && !@edit[:new][:selected_resources].include?(r.id)
         @edit[:new][:available_resources][r.id] = r.name