Breaking: #94861 - Deprecated form mixins removed 

See forge#94861

Description 

The deprecated EXT:form setup mixins from TYPO3.CMS.Form.mixins.* have been removed.

Impact 

Form setup inheriting mixins from TYPO3.CMS.Form.mixins.* will not work properly anymore.

Affected Installations 

All installations using the deprecated form setup mixins are affected.

Migration 

Embed the essential parts from TYPO3.CMS.Form.mixins.* or migrate them to custom mixins.