[TASK] Remove unused internal code

This code is either protected or marked as internal, and not in use
and can be removed.

Resolves: #90889
Releases: master
Change-Id: I45636e9117d00c05e7880275919b5ba30c12d6d6
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64013


Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Christian Eßl <indy.essl@gmail.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>