Add support in HAProxy / Chef / Config Management for releasing Workspaces HTTP Server on .com

MR: Pending

Description

Add support in HAProxy / Chef / Config Management for releasing Workspaces HTTP Server on .com as per the conversation in gitlab-com/gl-infra/production-engineering#27468 (comment 2786845164)

Acceptance criteria

• Workspaces HTTP Server is live on gstg. You should be able to create a workspace on staging and access it from the configured URL.
• Workspaces HTTP Server is live on gprd. You should be able to create a workspace on staging and access it from the configured URL.

Implementation plan

For each environment(gstg, gprd), do the following

• Define a pool for the environment (ref)
• Add an override for the port (ref)
• Add a backend definition in HAProxy (ref)
  • Add to enabled backends (ref) (This should be done on an environment level in chef-repo until rolled out to gprd)
• Add a frontend definition in HAProxy (ref)
  • Add to enabled frontends (ref) (This should be done on an environment level in chef-repo until rolled out to gprd)
• Adds DNS records through config-mgmt in Terraform:
  • *.staging.gitlab.dev
  • kas.staging.gitlab.com