[BUGFIX] Allow service aliases in ContentDataProcessor

Fetch services from the DI container and perform post-creations
checks instead of checking class_exists and therefore exclude
possible service aliases defined in DI.

Releases: master
Resolves: #95855
Resolves: #92910
Change-Id: Ic85485edc7604a92bdf72d147ad47fe79954500e
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/72029


Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Bartsch <bo@cedev.de>