Nominate a different user than uid1

Problem/Motivation

User 1 might not be the one to randomiser, since uid1 is effectively nullified, and any user can become "the one user", with https://www.drupal.org/node/2910500 →

Related thoughts https://github.com/drush-ops/drush/issues/6098

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes