[openstreetmap/openstreetmap-website] Add linting for .js.erb files (Issue #5523)

[Splines]

> Most stylistic rules are now removed from eslint because most use a formatter like prettier.io

@HolgerJeromin Formatting rules have indeed been [deprecated](https://github.com/eslint/eslint/issues/17522) in the _core_ of ESLint. But mainly because of ongoing maintenance cost. Luckily, antfu was willing [to set up a community-driven ESLint Stylistic repo](https://github.com/eslint-stylistic/eslint-stylistic) to continue maintaining those rules with a great community. Look at [their website](https://eslint.style/), it works really fine for us, even for our large [MaMpf codebase](https://github.com/MaMpf-HD/mampf/blob/23aae01471c4361b85e86df06e349cd8acfb735c/.config/eslint.mjs#L130-L138). See also their [Why?](https://eslint.style/guide/why), which talks about Prettier as well.

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