This pull request enhances the HTTP request retry logic in the client utilities to handle 409 Conflict errors in addition to existing retryable errors. It also adds improved logging for retry attempts and introduces new tests to ensure correct behavior when 409 errors occur.

Retry logic improvements:

• The retry utility now passes the current attempt number to the callback, allowing for more informative logging and control over retry behavior. [1] [2]
• The request logic has been updated to automatically retry on HTTP 409 Conflict responses, in addition to 5xx errors and specific error codes.
• Added debug logging to indicate when and why a request is being retried, including the attempt number and error reason.

Testing enhancements:

• Added tests to verify that 409 Conflict errors are retried and eventually succeed or fail after exhausting all retries (client.test.js and request.test.js). [1] [2]