Bring back ghcs and ghce

### Describe the feature or problem you'd like to solve

_No response_

### Proposed solution

I really enojyed using ghcs top quickly look up a command - with the deprication of the ``gh copilot`` feature it is not available anymore. Can we get it back please?

https://web.archive.org/web/20250726104159/https://docs.github.com/en/copilot/how-tos/configure-personal-settings/customize-copilot-in-the-cli

### Example prompts or workflows

_No response_

### Additional context

_No response_