CountryValidator allows "EU" as country but it's not in ISO_3166-1 #10807
Description
According to the documentation the Country validator should only allow countries from the ISO_3166-1 alpa-2 list.
One of the entries from Intl::getRegionBundle()->getCountryNames() is 'EU' => string 'European Union' (length=14) which is not in that ISO list.
So 'EU' is handled as valid, but it shouldn't be.