Coding Standards: Use array_first()/array_last() to get the first/last array element.

[im3dabasia]

Trac link: https://core.trac.wordpress.org/ticket/65598

Replace array_values( ... )[0] and array_slice( ..., 0, 1 )[0] constructs with the array_first() function (added in PHP 8.5, polyfilled in compat.php) for improved readability.

[github-actions]

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[github-actions]

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