Build: Simplify Docker layout, fix Envoy, and upgrade tests #2774
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It seems the Envoy apts have gone missing breaking out build, so instead of relying on the install let's docker compose their image as a proxy against the Redis supervisor instance as a simpler and faster-to-start setup that also works.
This rearranged some things to simplify the Docker story overall. A move to AzDO or just GitHub builds would simplify everything further, but we need to figure out Windows testing against a Docker setup in CI.
Note: we still can't use Linux containers on a Windows GitHub Actions host (actions/runner#904), so this remains much more complicated and not-really-testing-the-real-thing in the Windows front.