[TASK] Remove superfluous onclick events in FormEngine

Superfluous inline events have been removed or replaced
with native HTML functionality (location.href -> anchor).

Resolves: #91110
Releases: master
Change-Id: I594fe2df3c71234de096e437b5662867469ffbb7
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64229


Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Jonas Eberle <flightvision@googlemail.com>
Reviewed-by: Alexander Schnitzler <git@alexanderschnitzler.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Jonas Eberle <flightvision@googlemail.com>
Tested-by: Alexander Schnitzler <git@alexanderschnitzler.de>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Oliver Hader <oliver.hader@typo3.org>