Update non-AS docs for AS4 release
There are references to Apollo Server in other doc sets that need to be updated; primarily this is just updating package names and a bit of top-level APIs. Primarily these are in the `docs` (Studio, Tech Notes, etc) and `federation` (both `main` and `version-0.x` branches) repositories. When v4.0.0 is released, these should be updated to use the v4 packages.