Populate worker pre env

• Adds the pre environment for initial bootstraping
• Updates the router name to match the repo
• Explicitly set a different name per env to avoid conflicts
  • Workers namespace is account wide (not zone)
• Disables workers_dev by default which forces route management
  • Routes will be managed outside Wrangle config using Terraform
  • When workers_dev is enabled, Wrangler will try to manage routes

Deploy router to proxy requests to pre.gitlab.com (gitlab-org/gitlab#455070)