fix(phpstan): add checks for undefined constant in utils.php

A fix has been applied in the src/QUI/TemplateCologne/Utils.php file. A condition has been added to
check whether the PRODUCT_FIELD_SHIPPING_TIME constant is defined. If not, the function will return
false to prevent any potential errors.

src/QUI/TemplateCologne/Utils.php

@@ -611,6 +611,10 @@ public static function getShippingTimeFrontendView(int $productId): bool | QUI\E
             return false;
         }
 
+        if (!defined('PRODUCT_FIELD_SHIPPING_TIME')) {
+            return false;
+        }
+
         try {
             $ShippingField = $Product->getField(Shipping::PRODUCT_FIELD_SHIPPING_TIME);
         } catch (\Exception $Exception) {