feat: put merge orgs behaviour behind feature flag

app/models/form/sales/questions/owning_organisation_id.rb

@@ -37,14 +37,6 @@ class Form::Sales::Questions::OwningOrganisationId < ::Form::Question
         hsh
       end
     end
-
-    user_answer_options = if user.support?
-                            Organisation.where(holds_own_stock: true)
-                          else
-                            user.organisation.stock_owners + user.organisation.absorbed_organisations.where(holds_own_stock: true)
-                          end.pluck(:id, :name).to_h
-
-    answer_opts.merge(user_answer_options)
   end
 
   def displayed_answer_options(log, user = nil)