[TASK] Add declare(strict_types=1) in extbase fixtures

Files were merged after initial patch for all UnitTest files.

Resolves: #94746
Releases: master
Change-Id: Ib9c7ef1d93a331e59884c76606610fb3d5722fde
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70287


Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Simon Gilli <typo3@gilbertsoft.org>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Simon Gilli <typo3@gilbertsoft.org>
Reviewed-by: Benni Mack <benni@typo3.org>