TooWidePropertyTypeRule: dont skip always-read properties

[janedbal]

• Since this rule reports assignment issues, it is irrelevant if it is always read or not
• Found this by dropping similar rule of our own and Doctrine entities are no longer reported:

#[Entity]
class FooEntity 
{

    /**
     * @var array<string>|null
     */
    #[Column(type: Types::SIMPLE_ARRAY, nullable: true)]
    private ?array $zones; // null never assigned

    /**
     * @param list<string> $zones
     */
    public function __construct(
        array $zones,
    )
    {
        $this->zones = $zones;
    }

}