EntityReplicate action is broken

Sorry, meant to be in Replicate UI.

Still needs tests but here we go.

Actually this whole action is broken.

  public function execute($object = NULL) {
    $this->executeMultiple([$object]);
  }

This is a recursive loop, ActionBase::executeMultiple does this:

  public function executeMultiple(array $entities) {
    foreach ($entities as $entity) {
      $this->execute($entity);
    }
  }