[10.2 regression] CKEditor 5 prevents Styles from adding span as allowed HTML

Problem/Motivation

The Style plugin needs another plugin to create , for it to be able to create the following attributes: . Enable a plugin that supports creating this tag. If none exists, you can configure the Source Editing plugin to support it.

Previously you could just add <span class> to allowed "Allowed HTML tags"

Steps to reproduce

1. Define text format
2. Enable 'Limit allowed HTML tags and correct faulty HTML' features
3. Enable "Styles" button with
   

   span.text-large|Large
   span.text-primary|Primary Color
   span.text-secondary|Secondary Color

4. Save text format