agent: Add headers for code blocks (#28253)

<img width="639" alt="image"
src="https://github.com/user-attachments/assets/1fd51387-cbdc-474d-b1a3-3d0201f3735a"
/>


Release Notes:

- N/A

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Co-authored-by: Danilo Leal <daniloleal09@gmail.com>
Co-authored-by: Antonio Scandurra <me@as-cii.com>
b306a0221bBennet Bo Fenner committed on 4/7/2025, 11:56:24 PM· committed by GitHubparentd385a60
8 files changedLine totals unavailable