[TASK] Remove redundant type casts in ext:extbase

Some type casts in ext:extbase are superfluous, since it is
already ensured that the variable types are as expected.

This change removes all redundant type casts.

Resolves: #102876
Releases: main
Change-Id: Idbc40f5b127fe6d1724eb43a2c0792bbd00506c9
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82523


Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>