add ultra ai to related_resources.md

[VaibhavAcharya]

Summary

Briefly describe the changes and the goal of this PR. Make sure the PR title summarizes the changes effectively.

Motivation

Why are these changes necessary? How do they improve the cookbook?

Ultra AI is a new platform which offers command center for AI applications.

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For new content

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• I have added a new entry in registry.yaml (and, optionally, in authors.yaml) so that my content renders on the cookbook website.
• I have conducted a self-review of my content based on the contribution guidelines:
  • Relevance: This content is related to building with OpenAI technologies and is useful to others.
  • Uniqueness: I have searched for related examples in the OpenAI Cookbook, and verified that my content offers new insights or unique information compared to existing documentation.
  • Spelling and Grammar: I have checked for spelling or grammatical mistakes.
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  • Correctness: The information I include is correct and all of my code executes successfully.
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[github-actions]

This PR is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 10 days.

[VaibhavAcharya]

rm stale