[Content]: New address validation requirements in Commerce 4

[lukeholder]

Product

Commerce 4

Description

Since addresses are now validated with the used/required data from the addressing/google library, we should add an example of removing a required field that was not required previously:

Event::on(
    Address::class,
    Model::EVENT_DEFINE_RULES,
    function(DefineRulesEvent $event) {
        $event->rules = array_filter(
            $event->rules,
            function($rule) {
                return $rule[0] !== ['administrativeArea'] && $rule[1] !== 'required';
            }
        );
    }
);

Possibly to: https://craftcms.com/docs/commerce/4.x/upgrading.html#address-management

[lukeholder]

Context: https://discord.com/channels/456442477667418113/666747438794670140/1110354291304190003