fix: filter spans with run_type=uipath from LLM Ops export

[saksharthakkar]

Summary

• Filter internal UiPath SDK spans (run_type="uipath") from LLM Ops export
• Add run_type check to _should_drop_span() in LlmOpsHttpExporter
• Add tests for new filtering condition

Why move from uipath-agents-python?

The run_type="uipath" filtering was previously in uipath-agents-python span_processor.py#L29, but this approach has timing issues:

• At span start: run_type attribute is not yet set, so we can't filter
• At span end: spans are immutable, so we can't add telemetry.filter="drop"

Moving the filter to the exporter level in uipath-python:

• Filters spans at export time when all attributes are available
• Centralizes all span filtering logic in one place (_should_drop_span)
• Ensures filtering works regardless of which SDK creates the spans

Test plan

• Verify spans with run_type="uipath" are not exported to LLM Ops
• Verify spans with other run_type values pass through
• Verify existing telemetry.filter="drop" filtering still works
• Run unit tests: pytest tests/tracing/test_otel_exporters.py -k TestSpanFiltering

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