Update langchain-observability-snippet.ipynb

[jpantsjoha]

fixing the auth snippet section

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[RajeshThallam]

@jpantsjoha Thanks for the contribution. Can you please look at the failed checks? You may have to sign the CLA?

[michaelwsherman]

LGTM and thanks for this. But @jpantsjoha we still need a CLA and this should be refactored to point to the new location for this notebook (applied-ai-engineering-samples/genai-on-vertex-ai/langchain_observability_snippet/langchain-observability-snippet.ipynb .

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[jpantsjoha]

done. CLA signed.

[michaelwsherman]

Still errors -- click into the CLA error, make sure you've signed it with that email.

Also, there's a merge conflict, please resolve that so it can be merged into main.

Thank you!