Environment reload does not block

[callumforrester]

Reloading the environment via the CLI should block until reload is complete, but does not.

Steps To Reproduce

Steps to reproduce the behavior:

1. Run the server (blueapi serve)
2. In separate terminal run blueapi controller env -r, keep both terminals visible at the same time!
3. Observe the reload command return immediately while the server logs show it taking a couple of seconds to reload.

Acceptance Criteria

• blueapi env -r blocks until the server reloads
• If a timeout is supplied it blocks until the timeout is reached

[callumforrester]

This appears to be because the client polls the server to see when the environment is initialized, but actually receives information about the previous environment before it is taken down. The classic fix is to give each environment a unique ID, packaged into EnvironmentResponse so the client can tell the difference between the old and new environments.

[callumforrester]

Failing test here: #743