2024-April-11 - 2.6.14705

Revert - Use static file for latest version & lobby message (#12496)

- Updates how we fetch "latest version", we go back to reading it from a static file
  hosted in the code repository.

- Format of the code repository latest file 'servers.yml' is updated to have a top
  level 'message'. This removes the notion of a per-version message. The intent
  is for us to get off this file soon, the 'message' would one day come from
  somewhere else.

- The fetch of the 'lobby message' is moved back to the file as well. We need to
  read this information on any successful login to lobby.

- Remove dependency on docker compose tasks to run game-headed project. This needs
  to be redone.