Convert all remaining json manifests to yaml

This conversion can be validated using this script:

 #!/bin/bash

mkdir -p repo && cd repo && ostree init --repo . --mode=archive && cd ..
variants=('silverblue' 'kinoite' 'xfce' 'lxqt')

for v in ${variants[@]}; do
    sudo rpm-ostree compose tree --repo=repo --print-only fedora-$v.yaml > $v.yaml.out
done

git checkout --quiet HEAD~
for v in ${variants[@]}; do
    sudo rpm-ostree compose tree --repo=repo --print-only fedora-$v.yaml > $v.json.out
done

for v in ${variants[@]}; do
    if [[ ! -z $(diff $v.json.out $v.yaml.out) ]]; then
        echo ""
        echo "$v: JSON != YAML"
        diff $v.json.out $v.yaml.out
        echo ""
        has_diff="true"
    fi
done

git checkout --quiet master
rm -rf ./repo
for v in ${variants[@]}; do
    rm ./$v.json.out ./$v.yaml.out
done

if [[ $has_diff == "true" ]]; then
    echo "Found some diff!"
else
    echo "OK!"
fi

gnome-desktop-pkgs.yaml

@@ -0,0 +1,63 @@
+# DO NOT EDIT! This content is generated from comps-sync.py
+include: fedora-common-ostree.yaml
+packages:
+  - ModemManager
+  - NetworkManager-adsl
+  - NetworkManager-openconnect-gnome
+  - NetworkManager-openvpn-gnome
+  - NetworkManager-ppp
+  - NetworkManager-pptp-gnome
+  - NetworkManager-ssh-gnome
+  - NetworkManager-vpnc-gnome
+  - NetworkManager-wwan
+  - adobe-source-code-pro-fonts
+  - at-spi2-atk
+  - at-spi2-core
+  - avahi
+  - chrome-gnome-shell
+  - dconf
+  - gdm
+  - glib-networking
+  - gnome-backgrounds
+  - gnome-bluetooth
+  - gnome-classic-session
+  - gnome-color-manager
+  - gnome-control-center
+  - gnome-disk-utility
+  - gnome-getting-started-docs
+  - gnome-initial-setup
+  - gnome-remote-desktop
+  - gnome-session-wayland-session
+  - gnome-session-xsession
+  - gnome-settings-daemon
+  - gnome-shell
+  - gnome-software
+  - gnome-system-monitor
+  - gnome-terminal
+  - gnome-terminal-nautilus
+  - gnome-themes-extra
+  - gnome-user-docs
+  - gnome-user-share
+  - gvfs-afc
+  - gvfs-afp
+  - gvfs-archive
+  - gvfs-fuse
+  - gvfs-goa
+  - gvfs-gphoto2
+  - gvfs-mtp
+  - gvfs-smb
+  - libcanberra-gtk2
+  - libcanberra-gtk3
+  - libproxy-mozjs
+  - librsvg2
+  - libsane-hpaio
+  - mesa-libEGL
+  - mousetweaks
+  - polkit
+  - rygel
+  - tracker
+  - tracker-miners
+  - xdg-desktop-portal
+  - xdg-desktop-portal-gtk
+  - xdg-user-dirs-gtk
+  - yelp