Breaking: #94861 - Deprecated form mixins removed

See Issue #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.