Add SalesBot Weaviate Notebook

[erika-shorten]

What does this PR do?

I've added the SalesBot Weaviate example back to the end-to-end-use-cases folder. The initial submission was using OctoAI (deprecated), so I've updated the notebook to use NVIDIA NIM to access llama-3.3-70b-instruct.

I've tested the notebook end-to-end, and it works.

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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• Did you make sure to update the documentation with your changes?
• Did you write any new necessary tests?

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