[BUGFIX] trim md5 implementation for Abstract Graphical Tasks

This change falls back for the checksum of a shorter
md5 hash sum in order to avoid re-processing all existing
processed files.

Resolves: #94832
Related: #94684
Releases: master
Change-Id: Id23128a2b6466e2daa33c97d56aba24c2a1052fa
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70478


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: core-ci <typo3@b13.com>