Update Azure bring your own data cookbooks

[kristapratico]

Summary

This does not add new content, just makes necessary updates to existing cookbooks where changes were made in the latest preview Azure OpenAI API version.

1. The "bring your own data" or "on your own data" feature is now supported via the chat/completions endpoint instead of needing to target extensions/chat/completions. This allows us to remove the extra code/adapter ensuring we target /extensions.
2. Keyword argument dataSources now accepts snake_case data_sources.
3. Small change in response structure for context

This PR updates the cookbooks for the above API changes.

Motivation

API changes improve the usability of this feature + need to update cookbooks to ensure these examples continue run successfully

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