01-tutorials - [Content Improvement] - OpenLLMetry / Traceloop

**Which component is impacted by this improvement?**
- [ ] 01-AgentCore-runtime
- [ ] 02-AgentCore-gateway
- [ ] 03-AgentCore-identity
- [ ] 04-AgentCore-memory
- [ ] 05-AgentCore-tools
- [X] 06-AgentCore-observability
- [ ] 07-AgentCore-E2E

**Improvement Description**
Add a Traceloop-powered observability sample alongside the existing Braintrust walkthrough. The new tutorial lives under 06-AgentCore-observability/04-Agentcore-runtime-partner-observability and includes a Jupyter notebook plus accompanying agent file that instrument a Strands travel assistant with OpenLLMetry and stream spans to Traceloop. The notebook also highlights that the same wiring works for any OpenTelemetry-compatible sink (e.g., Traceloop, Datadog, Grafana Tempo, Honeycomb, Splunk) by swapping the OTLP endpoint and headers, aligning with the integrations catalog documented at https://traceloop.com/docs/openllmetry/integrations/introduction.