the `next-storybook` plugin throws an error since version `10.0.6-canary.9`, specifically since #17306:
```
ERR! WebpackOptionsValidationError: Invalid configuration object. Webpack has been initialised using a configuration object that does not match the API schema.
ERR! - configuration.module.rules should be an array
```
this PR makes `module.rules` an array again.
also see https://github.com/vercel/next.js/pull/17306#issuecomment-774996237
I tried the preset provided at `packages/next-plugin-storybook` but it was raising error due to an [unsafe negation](https://eslint.org/docs/rules/no-unsafe-negation) in the `preset.js` file.
I added a test to show the error:
```
● next-plugin-storybook filterModuleRules › should filter module rules correctly
TypeError: rule.test.test is not a function
48 | if (!rule.test instanceof RegExp) return true
49 | // use Next.js' built-in CSS
> 50 | if (rule.test.test('hello.css')) {
| ^
51 | return false
52 | }
53 | // use next-babel-loader instead of storybook's babel-loader
at filter (../packages/next-plugin-storybook/preset.js:50:21)
at Array.filter (<anonymous>)
at Object.filterModuleRules (../packages/next-plugin-storybook/preset.js:46:28)
at Object.<anonymous> (unit/webpack-config-overrides.test.js:12:36)
```
