Follow-up from "Populate AI Catalog Version Created By"

The following discussion from !214899 should be addressed:

• @ashmckenzie started a discussion:

  question / suggestion: Is there any disadvantage to perform the merging within build_new_version(), e.g.

  def build_new_version(version_params)
    item.build_new_version(version_params).merge(created_by: current_user)
  end

  and then (back to :sweat_smile::

            build_new_version(version_params)