Backport - Fix importFromArray by setting _isCollectionLoaded to true after import #21869

[slackerzz]

Description (*)

Back port of pull request #21869

Fixed Issues (if relevant)

1. Method importFromArray from \Magento\Eav\Model\Entity\Collection\AbstractCollection doesn't return a working collection #21868: Method importFromArray from \Magento\Eav\Model\Entity\Collection\AbstractCollection doesn't return a working collection

Manual testing scenarios (*)

1. Refer to Method importFromArray from \Magento\Eav\Model\Entity\Collection\AbstractCollection doesn't return a working collection #21868

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)

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[magento-engcom-team]

Hi @orlangur, thank you for the review.
ENGCOM-4787 has been created to process this Pull Request

[soleksii]

✔️ QA Passed

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After:

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