[TASK] Do not use uncommon constants for FormEngine node strings

Resolves: #104244
Releases: main
Change-Id: I9619e380bc32f7966ff6804390207312f9e7da3e
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/84986


Reviewed-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>