[TASK] Centralize ImageMagick logic for FAL in GraphicalFunctions

When FAL was introduced, some code from old GifBuilder
generation was copied to the Helper classes.

These now reside in GraphicalFunctions for further
refactorings and better API support.

Resolves: #101983
Releases: main
Change-Id: I5818e8b2e8c0ca51fee25547d2952f55c13eee37
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/81107


Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Andreas Nedbal <andy@pixelde.su>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Andreas Nedbal <andy@pixelde.su>
Tested-by: Stefan Bürk <stefan@buerk.tech>