Convert layout_builder_preprocess_language_content_settings_table to a preprocess hook

Tested this patch and it works well.

• The `layout_builder_preprocess_language_content_settings_table()` logic is migrated cleanly to a new class using the #[Hook] attribute.
• layout_builder.module is now safely removable.

Marking this RTBC.

Rather than hitting the remaining hooks piecemeal I have a bulk conversion issue here:

📌 Bulk convert the remaining hooks to OOP Active

Reviewing the process and pay patches would allow coverting all of core.

Ah thanks! I had the feeling there was an issue but either my search was bad or I skipped over it when I was looking at the related issues.

Still some discussion going on in that issue, so I'll postpone this for now and circle back once a descision is made on this and either un-postpone it or close it based on what is merged there.

For now, postponed on 📌 Bulk convert the remaining hooks to OOP Active