chore: add chat completion field form add remote engine

[urmauur]

Describe Your Changes

This pull request includes several changes to enhance the functionality of the ModalAddRemoteEngine and RemoteEngineSettings components, as well as updates to the utility functions related to engine management. The most important changes include adding support for a new chatCmpletionsUrl field, updating the UI to provide API key instructions, and adding utility functions for engine-specific URLs.

Enhancements to ModalAddRemoteEngine:

• Added chatCmpletionsUrl field to the engineSchema validation and form default values. [1] [2]
• Updated the form submission to include the chatCmpletionsUrl field.
• Added a new input field for chatCmpletionsUrl in the form UI.

Enhancements to RemoteEngineSettings:

• Added a link to the API key instructions for each engine in the settings UI.
• Updated the "Advance Settings" toggle to use ChevronDown icon when active.

Utility function updates:

• Added getAPIKeyInstructionURL function to return the API key instruction URL for each engine.

Fixes Issues

• Closes feat: Settings Page UI Extension  #3789
• Closes #

Self Checklist

• Added relevant comments, esp in complex areas
• Updated docs (for bug fixes / features)
• Created issues for follow-up changes or refactoring needed

[github-actions]

Barecheck - Code coverage report

Total: 69.26%

Your code coverage diff: 0.00% ▴

✅ All code changes are covered

[louis-menlo]

Let's go

[github-actions]

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