feat(core): Improve Langsmith traces for AI executions (#9081)

Signed-off-by: Oleg Ivaniv <me@olegivaniv.com>

packages/@n8n/nodes-langchain/utils/tracing.ts

@@ -0,0 +1,26 @@
+import type { BaseCallbackConfig } from '@langchain/core/callbacks/manager';
+import type { IExecuteFunctions } from 'n8n-workflow';
+
+interface TracingConfig {
+	additionalMetadata?: Record<string, unknown>;
+}
+
+export function getTracingConfig(
+	context: IExecuteFunctions,
+	config: TracingConfig = {},
+): BaseCallbackConfig {
+	const parentRunManager = context.getParentCallbackManager
+		? context.getParentCallbackManager()
+		: undefined;
+
+	return {
+		runName: `[${context.getWorkflow().name}] ${context.getNode().name}`,
+		metadata: {
+			execution_id: context.getExecutionId(),
+			workflow: context.getWorkflow(),
+			node: context.getNode().name,
+			...(config.additionalMetadata ?? {}),
+		},
+		callbacks: parentRunManager,
+	};
+}