[Backport] Fix SKU limit in import new products

Author: ravi-chandra3197

app/code/Magento/CatalogImportExport/Model/Import/Product.php

@@ -159,11 +159,6 @@ class Product extends \Magento\ImportExport\Model\Import\Entity\AbstractEntity
      */
     const URL_KEY = 'url_key';
 
-    /**
-    * SKU max length
-    */
-    const DB_MAX_SKU_LENGTH = 65;
-
     /**
      * Attribute cache
      *

app/code/Magento/CatalogImportExport/Model/Import/Product/Validator.php

@@ -7,6 +7,7 @@
 
 use Magento\CatalogImportExport\Model\Import\Product;
 use Magento\Framework\Validator\AbstractValidator;
+use Magento\Catalog\Model\Product\Attribute\Backend\Sku;
 
 /**
  * Class Validator
@@ -70,7 +71,7 @@ protected function textValidation($attrCode, $type)
         if ($type == 'text') {
             $valid = $this->string->strlen($val) < Product::DB_MAX_TEXT_LENGTH;
         } else if ($attrCode == Product::COL_SKU) {
-            $valid = $this->string->strlen($val) < Product::DB_MAX_SKU_LENGTH;
+            $valid = $this->string->strlen($val) < SKU::SKU_MAX_LENGTH;
         } else {
             $valid = $this->string->strlen($val) < Product::DB_MAX_VARCHAR_LENGTH;
         }