Remove uncessary packages from Whonix-KVM

[Patrick]

Gateway has audio support for accessibility support. → Orca Screen Reader
(Whonix is based on Kicksecure.)

The duplication pulseaudio + pipewire is because of dependency hell. Possible gdm3 might might be gone in the next release.

pulseaudio / pipewire might also be fully gone in favor of ALSA on day:

Switching to ALSA

The honorable @madaidan has pitched this suggestion because it is still updated and less of a problem to isolate with sandboxing. Questions are : is it easy to uninstall pulseaudio? Is there anything important that depends on it? How much space do we save? - If none then maybe it is not worth the bother. I remember at some point TBB refused to use anything but pulseaudio so this needs to be re-examined. Discuss.