[Tutorials] Update the SDG tutorial and expose the inference endpoint

[Maghoumi]

Description

This PR ensures that users can run the PEFT SDG tutorial using arbitrary API endpoints by exposing the URL that is used for synthetic data generation.

Checklist

• [X] I am familiar with the Contributing Guide.
• [X] New or Existing tests cover these changes.
• [X] The documentation is up to date with these changes.