It would be useful to have a method for waiting for the server to be available and ready to accept plans in BlueapiClient. I think we can achieve this by making the _wait_for_reload public and modifying it slightly.

Acceptance Criteria

• There is a method that polls until the server is
  • Up
  • Initialized
  • Ready to accept plans
• This method polls the environment endpoint
• There are unit tests for it
• It is used in the system tests to make sure the server is up