docs: Add Agenta integration documentation

[mmabrouk]

Add a new link to Agenta in the logfire page that documents how to integrate with Pydantic AI

[hyperlint-ai]

PR Change Summary

Added documentation for Agenta integration with Pydantic AI on the logfire page.

• Introduced a new link to Agenta in the logfire documentation
• Documented how to integrate Agenta with Pydantic AI

Modified Files

• docs/logfire.md

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