Issue #3592513: Render link text array before passing to Xss::filter()

Paul Woodheadrequested to merge
issue/radix-3592513:3592513-radixpreprocesslinksdropbutton-passes-render into 6.0.x

Guards $link['text'] with is_array() and renders it via renderInIsolation() before passing to Xss::filter(), fixing the fatal TypeError on Drupal 11.4.x. Tested on 11.4.x / PHP 8.3.

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