Replace finalize-deb.sh with Gradle DSL packagingResourcesRootDir

Once Compose offers the option packagingResourcesRootDir in its Gradle DSL (pull request/issue), we no longer need the utils/finalize-deb.sh script from !158 (merged).

changed milestone to %Desktop 0.4.0

added Infrastructure label

mentioned in merge request !158 (merged)

mentioned in merge request !158 (merged)

changed milestone to %Desktop 0.4.1

changed milestone to %Desktop 1.0.0

changed milestone to %Desktop 0.4.0

We actually won't need this script any longer once we merged !274 (merged) (need to remove the scripts there still)

assigned to @sebkur

mentioned in merge request !274 (merged)

added Sponsor 8 label

closed with merge request !274 (merged)