[BAckport] Fix SKU limit in import new products

[gelanivishal]

Original PR

#18639

Description (*)

Fix SKU limit in import new product

Fixed Issues (if relevant)

1. import new products via csv: products are created with empty value when strings are too long #17865: import new products via csv: products are created with empty value when strings are too long

Manual testing scenarios (*)

1. prepare a correct csv to create new products via backend. Use short values (less then 71 characters) for name/sku for a few records, then use a longer strings ((more then 71 characters) for name/sku for other records.

2. go to system > import:
   -- entity type = products
   -- import behaviour = add/update, skip error entries
   -- allow errors count = I tried with several numbers from 10 (default) to 500 but issue persists
   -- field separator = ; (semicolon)
   -- multiple value separator = , (comma, default)
   -- field enclosure = unchecked (default)

3. Select the csv to import and run check data

4. when strings are too long, I expect to see an error after I run check data. I also expect that import get blocked until all error are fixed so no products gets created until the check data allows you to proceed with the import.

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-engcom-team]

Hi @gelanivishal. Thank you for your contribution
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[sidolov]

Hi @gelanivishal , changes in the original PR are different and should be adopted for current version

[gelanivishal]

@sidolov Please check now.

[sivaschenko]

@gelanivishal thanks for update, can you please fix the failing builds. According to the static tests report an empty line should be added to the end of app/code/Magento/CatalogImportExport/Model/Import/Product/Validator.php file. That should be done to comply with the PSR2

[magento-engcom-team]

Hi @sivaschenko, thank you for the review.
ENGCOM-3481 has been created to process this Pull Request

[sivaschenko]

Hi @gelanivishal , thank you for your contribution, however, this pull request is a duplicate to #18591 that is already merged, so I have to close it.