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

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If you introduce linting here you might also be interested in:

- How we use ESLint on GitHub Actions via [this file](https://github.com/MaMpf-HD/mampf/blob/23aae01471c4361b85e86df06e349cd8acfb735c/.github/workflows/linter.yml#L39-L75) to lint only the changes inside changed `.js` and `.js.erb` files in a PR (see [this custom action](https://github.com/MaMpf-HD/mampf/blob/main/.github/actions/changed_files/action.yml)).
- A currently open [PR](https://github.com/MaMpf-HD/mampf/pull/730) where I try to set up linting of HTML files via [`html-eslint`](https://html-eslint.org/). Note that you can use my eslint-erb-plugin to also lint the HTML part of `.html.erb` files. Additionally, I set up Shopify's [`erb_lint`](https://github.com/Shopify/erb_lint) to also lint the Ruby part of `.html.erb` files.
- I haven't yet found a way to lint the Ruby part of `.js.erb` files. In the best case, it would work just like `erb_lint`.

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