Spike: Design for live preview of VS code

[YvanMOJdigital]

Context

Proposal

We should see if the simple browser in vs code actually works first

1. Add a new server block to NGINX similar to https://github.com/ministryofjustice/analytical-platform-cloud-development-environment-nginx-proxy/blob/main/src/etc/nginx/nginx.conf.template#L158 but listening on n+1 port and exposing another upstream port e.g. 8081
   • I suspect an update to https://github.com/ministryofjustice/analytical-platform-cloud-development-environment-nginx-proxy/blob/main/src/opt/lua-scripts/auth0-login.lua#L8 needs to be made to accept a new hostname
2. Update the deployment and service to surface this new proxy port
3. Expose this via a new ingress ${USERNAME}-${CDE_TOOL}-tunnel.${CDE_DOMAIN}

Spike Requirements

Definition of Done

[jacobwoffenden]

Done as part of #4167