ISTWCMS-7310: cookie banner a11y - make button be described by text

src/patterns/04-components/eu-cookie-compliance/eu-cookie-compliance.twig

 <div class="eu-cookie-compliance-banner eu-cookie-compliance-banner-info eu-cookie-compliance-banner--default">
     <div class="popup-content info eu-cookie-compliance-content" role="alertdialog">
         <div
-            id="popup-text"
             class="eu-cookie-compliance-message"
             id="{{ cookie.describedby_id }}">
             <h2>{{ cookie.label }}</h2>