teams/kde: Rework to add disk image build

This adds a disk image build profile to produce Fedora KDE images.
Additionally, these profiles are now tested in CI.

components/desktops/kde.xml

@@ -17,7 +17,6 @@
 		<package name="libreoffice-math"/>
 		<package name="fuse"/>
 		<package name="kde-l10n"/>
-		<package name="plasma-welcome-fedora"/>
 		<ignore name="@admin-tools"/>
 		<ignore name="gnome-disk-utility"/>
 		<ignore name="system-config-printer"/>