01-tutorials - [Content Improvement] - Add Datadog observability integration tutorial for AgentCore Runtime with Strands Agents.

**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**

A clear and concise description of the improvement.

```
Add Datadog observability integration tutorial for AgentCore Runtime with Strands Agents.

This improvement adds a complete tutorial demonstrating how to deploy a Strands agent to
Amazon Bedrock AgentCore Runtime with Datadog as the observability backend using OpenTelemetry (OTLP).

The tutorial includes:
- Step-by-step Jupyter notebook for deploying agents with Datadog telemetry
- Strands agent implementation with web search tool and automatic trace export
- Configuration guidance for all Datadog regions (US1, US3, US5, EU1, AP1)
- Integration with StrandsTelemetry for capturing agent invocations, tool calls, and LLM interactions

This enables users to leverage Datadog's APM, distributed tracing, and monitoring capabilities
for their AgentCore-hosted agents as an alternative to the default AgentCore observability.
```