Allow dates attributes in the rule engine

[romainruaud]

The rule engine should be able to support dates attributes (like created_at, updated_at).

Actually, if I configure one of these attributes as "Used for promo rules = Yes", I can see them in the rule engine when creating a virtual category, but selecting them triggers the following error :

[2024-04-18T07:21:52.492644+00:00] main.ERROR: Deprecated Functionality: DateTime::__construct(): Passing null to parameter #1 ($datetime) of type string is deprecated in /var/www/html/vendor/magento/module-rule/Model/Condition/AbstractCondition.php on line 684 [] []

There should not be any error, and we should be able to select a date as value with a date picker.

Of course, the resulting query should work.