feat: separate envoy lds configs for self-hosting and supabase use-cases

[hf]

Separates Envoy's lds.yaml file for two different use cases: self-hosting and for Supabase internal use.

For self-hosting:

• File remains to be called lds.yaml
• Includes only self-hosing concepts such as fixed API keys
• Control which lds.yaml file is used with the envoy_lds Docker build arg

For Supabase:

• File is called lds.supabase.yaml
• Is replaced into /etc/envoy/lds.yaml with an Ansible task part of ansible/tasks/setup-supabase-internal.yml
• For Fly, replaced using the envoy_lds Docker build arg
• In follow up PR it will contain an origin protection key which is not something available in the Docker image for self-hosting
• Future: once origin protection keys are rolled out and new API keys are in place, Envoy will no longer check any API keys

[hf]

A verbatim copy of lds.yaml

[hf]

Will bump versions after this is approved.

[samrose]

Ok to merge