[TASK] Make ClassSchema PHP 8 compatible

Several reflection methods are deprecated for a while
and throw errors with PHP8.

- ReflectionParameter::getClass()
- ReflectionParameter::isArray()

Both need to be replaced with the new api:

- ReflectionParameter::getType()

Releases: master, 10.4
Resolves: #92946
Change-Id: I9391cd260f0d4dba5eb03f63c1f74f01bd97e7e4
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/66936


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Benni Mack <benni@typo3.org>