B2B-2469: Improve category children loading

- functional fixes

Author: rganin

dev/tests/integration/testsuite/Magento/Catalog/_files/category_product.php

@@ -15,7 +15,7 @@
 )->setParentId(
     2
 )->setPath(
-    '1/2/3'
+    '1/2/333'
 )->setLevel(
     2
 )->setAvailableSortBy(

dev/tests/integration/testsuite/Magento/Catalog/_files/category_specific_fields.php

@@ -34,7 +34,7 @@
     ->setMetaKeywords('Category_en Meta Keywords')
     ->setMetaDescription('Category_en Meta Description')
     ->setParentId(2)
-    ->setPath('1/2/3')
+    ->setPath('1/2/10')
     ->setLevel(2)
     ->setIsActive(true)
     ->setPosition(1);