[BUGFIX] Fix phpstan errors from TypesAssignedToPropertiesRule

* EXT: backend
* EXT: belog
* EXT: beuser

In addition an adjustment is added that was forgotten in
https://review.typo3.org/c/Packages/TYPO3.CMS/+/69038

Resolves: #94126
Releases: master
Change-Id: I610b39268d417344517e76d7cc436da50d3db898
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/69134


Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Jochen <rothjochen@gmail.com>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Jochen <rothjochen@gmail.com>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>