[TASK] Fix phpstan checkFunctionArgumentTypes errors in ext:backend

This patch fixes incompatible type usage in function arguments
and is preparatory work for introducing native type hints and
strict mode in all core files.

Releases: master, 10.4
Resolves: #92111
Change-Id: I28058d9e9e9886f1156a0124f0b360d9788dfdc7
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/65466


Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Benni Mack <benni@typo3.org>