Consider linting against callback references

Passing callback as reference to methods like `Array#map` or `Array.filter` [can be dangerous when the reference function changes its signature in an type-compatible way](https://jakearchibald.com/2021/function-callback-risks/). There [exists an ESLint rule that can ensure we avoid this pattern](https://github.com/sindresorhus/eslint-plugin-unicorn/blob/main/docs/rules/no-array-callback-reference.md) in our code.

[As discussed with](https://github.com/guardian/dotcom-rendering/pull/11515/files#r1624452209) @tjmw