feat(platform): include jobKey in LLM Gateway trace baggage

build_trace_context_headers emits folderKey/agentId/processKey but omits
jobKey, even though UiPathConfig.job_key is available. LLM Gateway now
builds the model-call span from this baggage, so without jobKey the span
cannot be attributed to the originating job. Callers currently work around
this by hand-injecting jobKey via extra_baggage; emitting it natively fixes
it once for every caller.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: RunnanJia

packages/uipath-platform/src/uipath/platform/chat/llm_trace_context.py

@@ -44,6 +44,8 @@ def build_trace_context_headers(
         baggage_parts.append(f"agentId={agent_id}")
     if process_key := UiPathConfig.process_key:
         baggage_parts.append(f"processKey={process_key}")
+    if job_key := UiPathConfig.job_key:
+        baggage_parts.append(f"jobKey={job_key}")
     if baggage_parts:
         headers["x-uipath-tracebaggage"] = ",".join(baggage_parts)