Surface error on WS close, only retry retryable errors

[rasmusrygaard]

Two fixes for websocket error conditions:

1. When we close the websocket on the server, we sometimes provide additional context in the close message. We should surface this to the client so they can act on it. Typically this would be validation failures that the client needs to act on.
2. When we hit one of those conditions, the websocket client will retry 5 times by default. This is not useful if we get a non-retryable error back.

This PR encodes a list of retryable websocket codes. All other codes will break from the retry loop and surface the client-provided error.