[TASK] Avoid a useless trait in FormEngine

ext:backend Form/Element recently got a trait with #95954
that can be easily avoided by adding the method to
AbstractFormElement, which all elements should extend.

Resolves: #96071
Related: #95954
Releases: master, 11.5
Change-Id: I8dc73f17b976f8191bf39bae5b51f2609778797c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/72281


Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Jochen <rothjochen@gmail.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Jochen <rothjochen@gmail.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>