We're running both nginx and envoyproxy on wdqs hosts. There is a considerable amount of feature overlap between the two, and it could be useful to try and replace nginx with envoyproxy on wdqs so we don't have to run a separate service.

Additionally, this could help us prepare for using envoyproxy on our Opensearch hosts (we discussed this previously in T368950 , but elected to wait until our Elasticsearch -> Opensearch migration completes, see T370147 for more details)

Creating this ticket to:

• Explore our current nginx config and see if envoyproxy supports everything we are currently doing with nginx.
• Decide whether or not to actually migrate.