How can I safely remove snap without breaking apparmor
The AppArmor profile is located in /etc/apparmor.d/usr.lib.snapd.snap-confine.real file, which came from snapd package.
So you should use apt purge instead apt remove (see man apt for details):
sudo apt purge snapd
Small note: for me the snippet below looks better -
snap remove $(snap list | awk '{print $1}' | egrep -v "Name|core")