[!!!][TASK] Remove deprecated code from extbase type converters

Removal of code related to old way of extbase
type converter registration.

Resolves: #101057
Related: #100963
Related: #94117
Releases: main
Change-Id: I4e6f9306f6aaa323bd95c3d49875d3a02f6d4e40
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/79373


Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>