refactor: move responsibility of creator assignment in the SetAttributesService

modules/storages/app/services/storages/file_links/set_attributes_service.rb

@@ -27,4 +27,7 @@
 #++
 
 class Storages::FileLinks::SetAttributesService < ::BaseServices::SetAttributes
+  def set_default_attributes(_params)
+    model.creator ||= user
+  end
 end

modules/storages/lib/api/v3/file_links/create_endpoint.rb

@@ -76,7 +76,6 @@ module API::V3::FileLinks
 
     def params_modifier
       ->(params) do
-        params[:creator_id] = current_user.id
         params[:container_id] = work_package.id
         params[:container_type] = work_package.class.name
         params