[24.2] Fix to only show ChatGXY when available.

[dannon]

Exposes whether or not an llm api is configured to the client config, uses this to only display error wizard when it is.

How to test the changes?

(Select all options that apply)

• I've included appropriate automated tests.
• This is a refactoring of components with existing test coverage.
• Instructions for manual testing are as follows:
  1. [add testing steps and prerequisites here if you didn't write automated tests covering all your changes]

License

• I agree to license these and all my past contributions to the core galaxy codebase under the MIT license.

[jmchilton]

Test failures look unrelated.