fix(scores): skip sampling if OTEL sampler not available

[hassiebp]

Important

In resource_manager.py, add_score_task now defaults to in-sample if OpenTelemetry sampler is unavailable, ensuring scores are processed correctly.

• Behavior:
  • In add_score_task in resource_manager.py, skip sampling if OpenTelemetry sampler is not available by defaulting to in-sample.
  • Handles cases where event['body'].trace_id is None by ensuring scores are not sampled out.
• Misc:
  • Minor refactoring in add_score_task to improve readability and logic flow.

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Greptile Summary

Disclaimer: Experimental PR review

Fixes scoring sampling behavior in the Python SDK to ensure scores are not unintentionally dropped when OpenTelemetry sampling is not configured.

• Modified langfuse/_client/resource_manager.py to treat scores as 'in-sample' by default when using ProxyTracerProvider
• This prevents scores from being silently filtered when OTEL sampling is misconfigured
• Improves code readability through better structured sampling condition logic

[greptile-apps]

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