[UX Demo] Autoscale CI runners on OpenShift

Description

Demo autoscaling CI runners on Openshift. We likely won't have runners actually working on OpenShift at all, so this will be entirely faked.

Proposal

• Create fake job on Openshift with name appropriate for GitLab runners
• Be able to scale job via CLI
• Demo script:
  • Open OpenShift interface showing running jobs
  • Show GitLab process with nothing else, except perhaps master autoscale process
  • Run CI on demo project
  • Scale job off camera
  • Show OpenShift adding jobs and instances to handle jobs
  • ...
  • Profit

Links / references

Meta issue: #19793 (closed)

/cc @twk3