ACPT-1480: Implement _resetState for classes found by GraphQlB2BStateTest

Author: aa-kashk

lib/internal/Magento/Framework/Webapi/ServiceInputProcessor.php

@@ -583,6 +583,5 @@ protected function processInputError($inputError)
     public function _resetState(): void
     {
         $this->attributesPreprocessorsMap = [];
-        $this->attributesPreprocessorsMap = [];
     }
 }