LLMObs OOTB tool selection documentation

[stephaniewzhang]

What does this PR do? What is the motivation?

Add documentation for LLM Observability's new Out-of-the-Box tool selection evaluation. Includes a script example and screenshot of how it'll appear on the UI.

Merge instructions

Merge readiness:

• Ready for merge

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Additional notes

[github-actions]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/stephanie.zhang/tool-selection-documentation/llm_observability/evaluations/ootb_evaluations

[janine-c]

Looks awesome, thank you! One really small nit here that you're free to apply or ignore 🙂