Consume user activation in show the picker

More in-depth alternative to whatwg#10098. Fixes whatwg#10084, helps GHSA-hr74-5fj7-jgxp.

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@@ -52699,6 +52699,9 @@ You cannot submit this form when the field is incorrect.</samp></pre>
    <li><p>If <var>element</var> is not <i data-x="concept-fe-mutable">mutable</i>, then
    return.</p></li>
 
+   <li><p><span>Consume user activation</span> given <span>element</span>'s <span>relevant global
+    object</span>.</p></li>
+
    <li>
     <p>If <var>element</var> is an <code>input</code> element and <var>element</var>'s <code
     data-x="attr-input-type">type</code> attribute is in the <span