Improve clarity around how you can authenticate

[tidy-dev]

Describe the feature or problem you'd like to solve

Today, I ran /logout and closed copilot. Then ran copilot and expected I would need to authenticate, but I did not because it automagically used by token from gh cli.

Proposed solution

When checking for authentication say something like:

Checking for a GitHub Token in your environment, copilot /login, or gh cli login.

Using X.

When using /logout,

• If using environment or gh cli login, inform the user that they need to clear those tokens.

Optional: Allow configuration to not use the gh cli token or ask permission to use it.

Example prompts or workflows

• Login into gh cli.
• Run Copilot
• Run /Logout
• Close Copilot
• Run Copilot. See that you still login magically when maybe you expected not to.

Additional context

No response

[github-actions[bot]]

Thank you for your issue! We have categorized it as an enhancement, and it has been added to our backlog. In doing so, we are not committing to implementing this feature at this time, but, we will consider it for future releases based on community feedback and our own product roadmap.

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