eslint not working as expected on Webpack + TypeScript template project

### Pre-flight checklist

- [x] I have read the [contribution documentation](https://github.com/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 bug that matches the one I want to file, without success.

### Electron Forge version

6.2.1

### Electron version

25.3.1

### Operating system

macOS Ventura 13.4

### Last known working Electron Forge version

_No response_

### Expected behavior

Running `npm run lint` should output errors such as referring to an undefined variable.

### Actual behavior

Nothing gets outputted

### Steps to reproduce

Create new electron app using the Webpack + TypeScript template:
```bash
npm init electron-app@latest my-new-app -- --template=webpack-typescript
```

Modify l. 31 in `renderer.js` to artificially include a reference to an undefined variable:

```ts
console.log(`👋 This message is being logged by "renderer.js", included via webpack ${a}`); // a is not defined
```

Run eslint:
```bash
npm run eslint
```

### Additional information

_No response_