community/gnome: update dependencies, remove replaces and provides

gnome-text-editor replaced gedit upstream
gnome-screenshot is not needed, since the shell can screenshot now
gnome-console is preferred default, gnome-terminal kept for advanced use

Relates #13931 (closed)

Closes #14220 (closed)

@team/gnome @ralf1307 since you took part in the discussion

This has the potential to be infinitely bikeshedded, so I only did very obvious stuff.