fix(agents-api): Fix retrying the `resource busy` errors

[HamadaSalhab]

When a retry-decorated function finishes the maximum amount of retries and still throws an error, tenacity throws an error with type RetryError, so I added that to the list of retryable errors

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[!IMPORTANT] Added RetryError to RETRYABLE_ERROR_TYPES in tasks.py to handle exhausted retry cases.

• Error Handling:
  • Added RetryError to RETRYABLE_ERROR_TYPES in tasks.py to handle cases where a retry-decorated function exhausts retries and throws this error.

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