`cordova run --list --emulator` could also work outside of Cordova project

Currently:

```
λ cordova run --list --emulator
Current working directory is not a Cordova-based project.
```

Is there a reason this shouldn't also work outside of a Cordova project?

The issue names no files or tests. Start at the `cordova run --list --emulator` CLI entry point and trace why Cordova-project validation is required; define whether emulator listing can be separated from project validation, then verify the command works outside a project without changing its existing project behavior.

Written by the indexing model from the issue text.