community[minor]: Remove Dria retriever

[erhant]

Dria has been previously added with #4302

While Dria is an active project, it is no longer doing retriever services, and shall be removed from LangChain as such.

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[jacoblee93]

Thanks for cleaning up

Is the service completely gone now? Or would it be better to just remove from docs and add a warning?

[erhant]

Hey!

Is the service completely gone now? Or would it be better to just remove from docs and add a warning?

It's gone right now, so I think we should remove it all-together.

We had a similar PR langchain Python as well (langchain-ai/langchain#28687) but I think the versioning is a bit strict due to Python, but here in JS we use optional dependencies etc. so if possible removal is better 🙏🏻

[efriis]

hey can we all chat on langchain-ai/langchain#28687 ?

it's unusual to ask to remove docs from langchain for a service that still documents the integration in their own docs, especially because this langchain integration is still documented in the dria docs https://dria.co/docs/integrations/langchain