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scylladb/utils
Pavel Emelyanov 23089e1387 Merge 'Enhance S3 client robustness' from Ernest Zaslavsky
This PR introduces several key improvements to bolster the reliability of our S3 client, particularly in handling intermittent authentication and TLS-related issues. The changes include:

1. **Automatic Credential Renewal and Request Retry**: When credentials expire, the new retry strategy now resets the credentials and set the client to the retryable state, so the client will re-authenticate, and automatically retry the request. This change prevents transient authentication failures from propagating as fatal errors.
2. **Enhanced Exception Unwrapping**: The client now extracts the embedded std::system_error from std::nested_exception instances that may be raised by the Seastar HTTP client when using TLS. This allows for more precise error reporting and handling.
3. **Expanded TLS Error Handling**: We've added support for retryable TLS error codes within the std::system_error handler. This modification enables the client to detect and recover from transient TLS issues by retrying the affected operations.

Together, these enhancements improve overall client robustness by ensuring smoother recovery from both credential and TLS-related errors.

No backport needed since it is an enhancement

Closes scylladb/scylladb#22150

* github.com:scylladb/scylladb:
  aws_error: Add GNU TLS codes
  s3_client: Handle nested std::system_error exceptions
  s3_client: Start using new retry strategy
  retry_strategy: Add custom retry strategy for S3 client
  retry_strategy: Make `should_retry` awaitable
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