Disable Fomantic's CSS tooltips (#16974)

CSS-only tooltips suffer various issues with positioning and there was
only one single instance of them in the templates. Replace that instance
with a regular popup and exclude these `data-tooltip` styles from the
Fomantic build.

web_src/fomantic/_site/globals/site.variables

@@ -5,3 +5,4 @@
 @bold: 500;
 @useCustomScrollbars: false;
 @disabledOpacity: var(--opacity-disabled);
+@variationPopupTooltip: false;