Changes to Fetch and update agenda from agenda integration

removed the media type text/plain for the response with the status 401

removed the media type text/plain for the response with the status 403

removed the media type text/plain for the response with the status 404

removed the media type text/plain for the response with the status 500

added the media type application/json for the response with the status 401

added the media type application/json for the response with the status 403

added the media type application/json for the response with the status 404

added the media type application/json for the response with the status 500

endpoint added