`import` command should optionally copy CI files over

### Pre-flight checklist

- [X] I have read the [contribution documentation](https://github.com/electron-userland/electron-forge/blob/main/CONTRIBUTING.md) for this project.
- [X] I agree to follow the [code of conduct](https://github.com/electron/electron/blob/main/CODE_OF_CONDUCT.md) that this project uses.
- [X] I have searched the issue tracker for a feature request that matches the one I want to file, without success.

### Problem description

Similar to initializing a new repository, the `import` command should add the ability to create new CI files that work with Forge.

### Proposed solution

Add `--copy-ci-files` flag to `import` command.

### Alternatives considered

Status quo—this is optional entirely

### Additional information

_No response_