[TASK] Replace prophecy in EXT:form DataStructureIdentifierListenerTest

Resolves: #98905
Releases: main
Change-Id: I28f6cc1f4323094f80bf1c216767d490ab95fae3
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/76836


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