message: Remove the repeated device in a group warning.
  If there are multiple instances with the same `group_key`, this warning appears in the log for every instance except the first one.
diff: @@ -176,12 +176,6 @@ void CollectiveParamResolverLocal::CompleteGroupLocal(
  << (gr->group.group_size - gr->device_set.size());
  }
  }
  - } else {
  - // Repeated device in a group. This may be because of control flow or
  - // it may be a group configuration error.
  - LOG(WARNING) << "Collective op " << cp->name
  - << " got duplicate CompleteGroup calls for group "
  - << cp->group.group_key << " and device " << device;
  }
  }
  