Convert models to use new search includes mechanism

app/models/bulk_update_request.rb

@@ -35,7 +35,7 @@ class BulkUpdateRequest < ApplicationRecord
     def search(params = {})
       q = super
 
-      q = q.search_attributes(params, :user, :approver, :forum_topic_id, :forum_post_id, :script, :tags)
+      q = q.search_attributes(params, :script, :tags)
       q = q.text_attribute_matches(:script, params[:script_matches])
 
       if params[:status].present?
@@ -152,6 +152,10 @@ class BulkUpdateRequest < ApplicationRecord
     status == "rejected"
   end
 
+  def self.searchable_includes
+    [:user, :forum_topic, :forum_post, :approver]
+  end
+
   def self.available_includes
     [:user, :forum_topic, :forum_post, :approver]
   end