[TASK] Push DataHandling functional test extension down one level

All functional tests in DataHandling category (both workspaces and core)
used to load the ext:irre_tutorial test extension in the uppermost
abstract class. Not all of the tests use it though, and even declare
additional test extensions. In order to clean up and provide test cases
only with data they need and use, as a first step each abstract class
below the highest level abstract declare their test extensions
individually.

Resolves: #95950
Releases: master
Change-Id: If7922f16def8a0bde1de034f224bcd2b838f0d8f
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/72150


Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>