401 Responses from the Codestory provider should be relayed to IDE

[g-danna]

Bug description
The Codestory provider, Anton, now makes a check for the validity of the access token. If it's not valid, it returns a 401. This response should be relayed by the web server to IDE, but it isn't.

To Reproduce

1. Use an expired auth token when making requests to sidecar
2. Look at the agent output. It should relay the 401 to the consumer (IDE), but instead it marks the session as finished.

Expected behavior
The web server should return a 401 as the response to the POST requests made to it, if Anton returns a 401 when checking the access token validity.

[theskcd]

ACK, on it!

[g-danna]

Pretty dang cool