Skip retries for defined SlackAPIErrorCode

[jschroth]

Does not retry for any item in the SlackAPIErrorCode enum

[wssheldon]

You should be able to simplify this down to:

def should_retry(exception: Exception) -> bool:
    match exception:
        case SlackApiError():
            return exception.response["error"] not in SlackAPIErrorCode.__members__.values()
        case TimeoutError() | Timeout():
            return True
        case _:
            return False

[wssheldon]

We could also implement __contains__ on DispatchEnum to allow exception.response["error"] not in SlackAPIErrorCode