Settings or Policy to disable autopilot

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

Need a setting to prevent users from using autopilot only current option is to not select it

### Proposed solution

Add a policy to GitHub enterprise policy that we can disable autopilot for all users in the enterprise.

Also, add a setting so we can also turn it off via a configuration setting.

### Example prompts or workflows

_No response_

### Additional context

As we have lots of people using AI for the first time, we would like to control some of these settings at an enterprise level.