[FOLLOWUP][!!!][TASK] Replace ClassInfo with ClassSchema

Increase test coverage of ClassSchema and ReflectionService

Releases: master
Resolves: #57594
Resolves: #55654
Change-Id: If413dc0b428f94dffef13e1875e3a7af4f9939b7
Reviewed-on: https://review.typo3.org/54482


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Jigal van Hemert <jigal.van.hemert@typo3.org>
Tested-by: Jigal van Hemert <jigal.van.hemert@typo3.org>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>