docs: Add LangWatch to list of observability platforms

[richhuth]

No description provided.

[hyperlint-ai-deprecated]

PR Change Summary

Added LangWatch integration documentation to the existing Pydantic AI providers list.

• Added LangWatch to the list of providers in the documentation
• Updated the documentation to include a link to LangWatch integration

Modified Files

• docs/logfire.md

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[DouweM]

@richhuth Thanks Richard