[ENH] replaces all repeated spaces, newlines and tabs with a single space

This ensures the <td> text will not render with a starting <br> when it has \n or some space on its beginning

In replacement to !1620 (merged)

Task: https://avan.tech/item80142-Backport-to-24-x-PluginList-reports-categories-and-emails-should-be-top-aligned-like-the-other-data-types