Add switch to enable/disable narrative generation.

The Publisher is now capable of narrative generation. It will only generate narrative if the resource does not already contain it. This means that running the refresh tooling - which generates narrative - before running the Publisher will result in the Publisher not generating narrative. We need to add a switch to the refresh tooling to turn off narrative generation so that it can be left to the Publisher.

Start by locating the refresh tooling and its narrative-generation path, then compare it with the Publisher behavior described in the issue. Add a switch that allows refresh-time narrative generation to be disabled, and verify that the Publisher can still generate narrative when the resource does not already contain it.