ACP2E-156: Merchants can create custom attribute, but it causes an error when trying to save an entity account

- resolve code review comments

Author: o-dubovyk

app/code/Magento/Eav/Model/ReservedAttributeChecker.php

@@ -26,7 +26,7 @@ class ReservedAttributeChecker implements ReservedAttributeCheckerInterface
      * @param array $validators
      */
     public function __construct(
-        $validators = []
+        array $validators = []
     ) {
         $this->validators = $validators;
     }
@@ -37,11 +37,6 @@ public function __construct(
     public function isReservedAttribute(AbstractAttribute $attribute): bool
     {
         $isReserved = false;
-        try {
-            $attribute->getEntityType();
-        } catch (LocalizedException $exception) {
-            $isReserved = false;
-        }
         $validators = $this->validators[$attribute->getEntityType()->getEntityTypeCode()] ?? [];
         foreach ($validators as $validator) {
             $isReserved = $validator->isReservedAttribute($attribute);

app/code/Magento/Eav/etc/di.xml

@@ -9,6 +9,7 @@
     <preference for="Magento\Eav\Model\Entity\Setup\PropertyMapperInterface" type="Magento\Eav\Model\Entity\Setup\PropertyMapper\Composite" />
     <preference for="Magento\Eav\Model\Entity\AttributeLoaderInterface" type="Magento\Eav\Model\Entity\AttributeLoader" />
     <preference for="Magento\Eav\Model\Entity\Attribute\UniqueValidationInterface" type="Magento\Eav\Model\Entity\Attribute\UniqueValidator" />
+    <preference for="Magento\Eav\Model\ReservedAttributeCheckerInterface" type="Magento\Eav\Model\ReservedAttributeChecker" />
     <preference for="Magento\Eav\Api\Data\AttributeInterface" type="Magento\Eav\Model\Entity\Attribute" />
     <preference for="Magento\Eav\Api\AttributeRepositoryInterface" type="Magento\Eav\Model\AttributeRepository" />
     <preference for="Magento\Eav\Api\Data\AttributeGroupInterface" type="Magento\Eav\Model\Entity\Attribute\Group" />