[TASK] Allow `Element` and `DocumentFragment` in Multi Step Wizard

This commit enables the usage of `Element` and `DocumentFragment` types
in the `@typo3/backend/multi-step-wizard` module.

Resolves: #103268
Releases: main
Change-Id: I29e755ea799298f8c13e6bea3369f5d3eed76c50
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/83193


Reviewed-by: Andreas Nedbal <andy@pixelde.su>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Andreas Kienast <a.fernandez@scripting-base.de>
Tested-by: Andreas Kienast <a.fernandez@scripting-base.de>
Reviewed-by: Simon Schaufelberger <simonschaufi+typo3@gmail.com>
Tested-by: Andreas Nedbal <andy@pixelde.su>
Tested-by: Benni Mack <benni@typo3.org>