fix(flushing): rely on OTEL default flush settings

[hassiebp]

Important

Modify LangfuseSpanProcessor to use OpenTelemetry's default flush settings when environment variables are not set.

• Behavior:
  • Modify LangfuseSpanProcessor in span_processor.py to use OpenTelemetry's default flush settings when LANGFUSE_FLUSH_AT and LANGFUSE_FLUSH_INTERVAL are not set.
  • flush_at and flush_interval are set to None if environment variables are not provided, allowing OpenTelemetry defaults to apply.

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Greptile Summary

Disclaimer: Experimental PR review

Modifies flush settings handling in langfuse/_client/span_processor.py to better align with OpenTelemetry's default behavior, removing hardcoded fallback values.

• Removes hardcoded defaults (15 for flush_at, 0.5 for flush_interval) in favor of OpenTelemetry's native BatchSpanProcessor defaults
• Changes environment variable handling to pass through None values when not explicitly set
• Improves integration with OpenTelemetry's standard behavior for span processing

[greptile-apps]

LGTM

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