Don't send Publishing API HTTP conflict errors to Sentry
Don't send Publishing API HTTP conflict errors to Sentry

These are unactionable, as the Publishing API is saying that there's
nothing to Publish. This error relates to Whitehall using workers to
send content to the Publishing API, which is ideally something that
won't happen eventually.

alphagov/whitehall,alphagov/whitehall,alphagov/whitehall,alphagov/whitehall