[Forwardport] Improve retrieval of first array element

[thomas-kl1]

Original Pull Request

#16053
Work has started in #14609

Description

Fix the way to retrieve the first item of an array, with reset and key functions.

[magento-engcom-team]

Hi @thomas-blackbird. Thank you for your contribution
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[magento-engcom-team]

Hi @orlangur, thank you for the review.
ENGCOM-1994 has been created to process this Pull Request

[magento-engcom-team]

Hi @thomas-blackbird. Thank you for your contribution.
Changes from your Pull Request will be available with the upcoming 2.3.0 release.