GraphQL Plugin extension policy customization throws "Policy not found."
### Node Version

20

### NPM/Yarn/PNPM Version

10

### Strapi Version

5.8.0

### Operating System

Windows 11

### Database

PostgreSQL

### Javascript or Typescript

Javascript


### Bug Description

Hello Team,

I'm trying to use the extension service to block access to certain graphql queries. I am following the documentation exactly, but it is not working as expected. Strapi throws a "policy not found" error immediately on startup.

https://docs.strapi.io/dev-docs/plugins/graphql#policies

Any ideas?

thanks and kind regards
Luca


### Steps to Reproduce

in `./src/index.js` add this from the documentation:

```javascript
module.exports = {
  register({ strapi }) {
    const extensionService = strapi.plugin('graphql').service('extension');

    extensionService.use({
      resolversConfig: {
        'Query.me': {
          policies: [
            (context, { strapi }) => {
              return false
            }
        },
      }
    })
  }
}
```

me is an ootb query / from the user-permissions plugin and should be blocked for graphql requests.

Adding the above customization directly throws the mentioned error on boot.

### Expected Behavior

Product and Plugin Query policies can be set via the plugin extension service

### Logs

```shell
 Error: Policy  not found.                                                                                               │
│   at resolveHandler                                                                                                       │
│   (E:\workspace\luca\code\projects\strapixx\node_modules\@strapi\core\dist\registries\policies.js:37:13)            │
│   at E:\workspace\luca\code\projects\strapxxi\node_modules\@strapi\core\dist\registries\policies.js:100:20          │
│   at Array.map (<anonymous>)                                                                                              │
│   at Object.resolve
```

### Confirmation Checklist

- [x] I have checked the existing [issues](https://github.com/strapi/strapi/issues) for duplicates.
- [x] I agree to follow this project's [Code of Conduct](https://github.com/strapi/strapi/blob/develop/CODE_OF_CONDUCT.md).