[TASK] Remove unused imports in codebase

PHP CS Fixer is not able to detect unused imports, when the import is
mentioned somewhere in the doc comments. Therefore we have several
unused imports in our codebase.

This change removes all current unused imports.

Resolves: #103475
Releases: main
Change-Id: Ibd190234a9c0f1519592ac715943a88e52cd17c5
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/83579


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