fix: filter dropped spans in upsert_span to match export behavior

[saksharthakkar]

Root Cause

OpenInference spans (LangGraph internal nodes like init, agent, route_agent) were appearing in LLMOps traces despite being marked with telemetry.filter=drop.

The LlmOpsHttpExporter had two export paths:

• export() - batch export, had filtering via _should_drop_span()
• upsert_span() - real-time upsert for live tracking, missing filtering

The agents package calls upsert_span() for live visibility, which bypassed the filtering.

Fix

Added the same _should_drop_span() check to upsert_span():

def upsert_span(self, span, status_override=None):
    if self._should_drop_span(span):  # ← Added this
        return SpanExportResult.SUCCESS
    # ... rest of method

Now both paths consistently filter spans marked for dropping.

Test plan

• Unit test test_upsert_span_filters_dropped_spans passes
• Run agent with OpenInference instrumentation and verify no LangGraph internal spans appear in LLMOps

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