On user profiles, indicate if the user's 'work' organization has an organization node on Drupal.org

Many of the organizations that users on Drupal.org work for have organization profiles. We want to link to those org profiles to create a better connection between users and their orgs.

Production outage: No
Change affects: Drupal.org user profiles
Deployment schedule: targeted for the week of 2018-04-30
Backout plan: revert or fix in place