[BUGFIX] Consistently use EventDispatcherInterface

TYPO3 should never expose its EventDispatcher
implementation but only work with the PSR-14 interface
(SOLID principle).
Also avoid GeneralUtility::getContainer() as that's
internal and non recommended API in favor of makeInstance
where dependency injection is not yet possible.

Resolves: #96665
Releases: main, 11.5
Change-Id: Ifacb7e64bc55bcfdf58a8de454a3cebc4e602817
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/73190


Tested-by: Benjamin Franzke <bfr@qbus.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Benjamin Franzke <bfr@qbus.de>