fix: correctly import jest flat configs

[sbellone]

I figured out that Jest flat configs are containing the following:

{
  plugins: { jest: plugin },
  languageOptions: { globals },
  rules,
}

https://github.com/jest-community/eslint-plugin-jest/blob/98087f9bb27082f9fbda59a56c65536fb9d8a0dc/src/index.ts#L95

So spreading the style config in the same config object than the recommended config was actually overriding it.

Tests

I've added a simple test file with some disabled rules, and set reportUnusedDisableDirectives to error so it will report if those rules are not included anymore.

[millotp]

good catch !