DataHygiene::PublishingApiPublisher should 'republish'
DataHygiene::PublishingApiPublisher should 'republish'

Updates should be sent as 'republish' messages. The only use case for
this class is bulk-republishing already-published things, so it seems
reasonable to make this the default.

alphagov/whitehall,ggoral/whitehall,ggoral/whitehall,askl56/whitehall,alphagov/whitehall,YOTOV-LIMITED/whitehall,hotvulcan/whitehall,robinwhittleton/whitehall,askl56/whitehall,robinwhittleton/whitehall,robinwhittleton/whitehall,YOTOV-LIMITED/whitehall,askl56/whitehall,robinwhittleton/whitehall,hotvulcan/whitehall,ggoral/whitehall,alphagov/whitehall,hotvulcan/whitehall,YOTOV-LIMITED/whitehall,YOTOV-LIMITED/whitehall,hotvulcan/whitehall,askl56/whitehall,ggoral/whitehall,alphagov/whitehall