[BUGFIX] Use correct php namespace for NoopEventDispatcher

NoopEventDispatcher was originally a text fixture class
to help during testing. This class has been made available
to extension developers with #99070.

However, #98808 has been mergend without prior rebasing and
having wrong namespace for this class in a test class.

This change now uses the correct namespace to ensure tests
are working again.

Resolves: #99076
Related: #99070
Related: #98808
Releases: main
Change-Id: Ibe28b8e56b18c6899e3a1935e97e6df9e68803d4
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/76582


Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>