[TASK] Change Modal in form manager

The modals duplicate form and reference overview have been adapted to
the new styling of the new form wizard.

* Clean up markup and use common colors of TYPO3 v11
* Use new common styles and elements for better overview and modern look

Resolves: #95085
Releases: master
Change-Id: I6b1fc1332230c9bb966184d66944875ec7ebc4dc
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70878


Tested-by: core-ci <typo3@b13.com>
Tested-by: Björn Jacob <bjoern.jacob@tritum.de>
Tested-by: Tobias Siegler <siegler.tobias@googlemail.com>
Tested-by: waldhacker <hello@waldhacker.dev>
Reviewed-by: Björn Jacob <bjoern.jacob@tritum.de>
Reviewed-by: Tobias Siegler <siegler.tobias@googlemail.com>
Reviewed-by: waldhacker <hello@waldhacker.dev>