Perform cleanup of urgent-cpu-bound references

Now that the migration has been completed, let's clean up a few items:

• Terraform - ensure all instances are removed
  • The node count for urgent-cpu-bound should be set to 0 and this should applied to each environment
  • Validate that the nodes are terminated and unregistered from chef
• Chef - ensure all roles are removed - from repo and chef server
  • The roles for urgent-cpu-bound can be deleted
  • Update the sidekiq tooling that generates the configurations such that they do not continue to generate those roles
  • Ensure the removed roles are deleted from the chef server, example knife role delete <ROLE_NAME>

This needs to be done for the following environemtns:

• staging
• production