Remove JsUnicodePropertiesPostEs2018 list

[slevithan]

The current system for restricting Unicode properties added after certain ES versions based on the target option used doesn't scale and is already slightly incorrect. What's currently listed as "ES2023 scripts" is actually ES2023+ (and includes up to Unicode 16.0, released after ES2024) since ES2022 was the last version to include a table with script names in the spec. Since then, ES specs just require using the latest version of Unicode.