DCC bug 722 - Fix for dealing with situation where Rest API call           "/api/v0/plans?page=ALL" was timing out because the processing was taking too long.
DCC bug 722 - Fix for dealing with situation where Rest API call
          "/api/v0/plans?page=ALL"
was timing out because the processing was taking too long.

Fix for bug https://github.com/DigitalCurationCentre/DMPonline-Service/issues/722

The following change seems to make a difference:
- in /api/v0/plans_controller.rb the index() method
   replaced includes() with preload():
    @plans = org_admin_plans.includes([{ roles: :user }, { answers: :question_options },
                                           template: [{ phases: {
                                             sections: { questions: %i[question_format themes] }
                                           } }, :org]])

CDLUC3/dmptool,DMPRoadmap/roadmap,CDLUC3/dmptool,DMPRoadmap/roadmap,DMPRoadmap/roadmap,CDLUC3/dmptool,CDLUC3/dmptool