Test websocket consumers

[theo-o]

What part of the codebase needs to be tested

WebSocket consumers (wss://)

Sample test cases that should definitely be covered

• Close incoming webSocket connections that don't match a route.
• Test /bus connections as an unauthenticated user
• Test /bus connections as a random user
• Test connections to /bus
  • Unassigning a bus
  • Assigning a bus
  • Listing buses

Related to https://github.com/tjcsl/ion/pull/915

[theo-o]

In addition, we should probably test whether CancelledErrors are being trigerred.