Check if self-hosted instance has the ability to reach the customers.gitlab.com API

Problem

As a user, my GitLab instance can't communicate with the internet. My instance must be firewall-ed from the outside world. As a result, GitLab should check if my instance can't communicate with the customers.gitlab.com api, it should direct me to a different paid signup path.

Prototype

Untitled_drawing__7_

Requirements

  1. Checks if the instance can contact the customers.gitlab.com api
  2. Redirects users to a different UX when the instance cannot contact the customers.gitlab.com api
  3. Directs users through the paid signup flow if the instance can contact the customers.gitlab.com api