Important

Convert flush_interval to milliseconds in LangfuseSpanProcessor and update documentation for LANGFUSE_FLUSH_INTERVAL.

• Behavior:
  • Convert flush_interval from seconds to milliseconds in LangfuseSpanProcessor.__init__() in span_processor.py.
  • Update LANGFUSE_FLUSH_INTERVAL documentation in environment_variables.py to specify delay is in seconds.
• Misc:
  • Adjust schedule_delay_millis calculation in LangfuseSpanProcessor.__init__() to handle None values.

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