Retry Fixes

[JR-Morgan]

• Fixed reporting of retries:
  • We were never incrementing the retry number given to the logger, so it was allways reporting as 0 even if it had retried.
  • Looks like a regression introduced by https://github.com/specklesystems/speckle-sharp/pull/2305 when we commented out some logging.
  • Also fixed the headers which previously were appending new correlation ids with every retry.
• Removed ancient flawed retries loop in ServerAPI
  • Clients already retry with proper backoff policy, this naive loop was only causes problems for the server.