docs(auth4genai): Update CTE profile creation instruction to use auth0-cli

[patrickkang]

Description

Update CTE profile creation instruction to use auth0-cli https://auth0.com/ai/docs/mcp/get-started/call-your-apis-on-users-behalf#set-up-the-token-exchange-profile

References

• https://github.com/auth0/auth0-cli/releases/tag/v1.25.0

Testing

• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not the default branch