[master] Catalog tag search still uses removed description columns

Product and article tags were moved to the tag, product_to_tag, and article_to_tag tables. PR #15640 fixed the clean installation, but the catalog still queries the removed product_description.tag and article_description.tag columns.

Affected code

• Product filtering: getProducts() and getTotalProducts()
• Product tag display: catalog/controller/catalog/product.php
• Article filtering: getArticles() and getTotalArticles()
• Article tag display: catalog/controller/cms/article.php

Expected behavior

Keep the existing tag search URL unchanged:

index.php?route=product/search&tag=Tag Name

Update the catalog queries and tag loading to use the new relation tables. No catalog code should query the removed description columns.