MC-38995: Customer group price is not working in product query graphql

Author: Oleksandr Iegorov

app/code/Magento/CustomerGraphQl/etc/extension_attributes.xml

@@ -8,6 +8,7 @@
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Api/etc/extension_attributes.xsd">
     <extension_attributes for="Magento\GraphQl\Model\Query\ContextInterface">
         <attribute code="is_customer" type="boolean"/>
+        <attribute code="id_customer_group" type="integer"/>
         <attribute code="customer_group" type="integer"/>
     </extension_attributes>
 </config>