kraft rm does not kill qemu process if the VM is not started

[LucaSeri]

Describe the bug

Run a kernel without starting it. Then remove it. The qemu process is never killed.

Steps to reproduce

$ ps aux | grep qemu
305:kero       27961  0.0  0.0  12100  2688 pts/1    S+   16:21   0:00 grep -n --color qemu

$ kraft run nginx:1.25 --no-start
nervous_maggie

$ kraft ps --all
NAME            KERNEL            ARGS            CREATED        STATUS   MEM  PORTS  PLAT
nervous_maggie  oci://nginx:1.25  /usr/bin/nginx  4 seconds ago  created  64M         qemu/x86_64

$ kraft rm --all
nervous_maggie

$ kraft ps --all
NAME  KERNEL  ARGS  CREATED  STATUS  MEM  PORTS  PLAT

$ ps aux | grep qemu
304:root       27997  0.5  0.2 383056 70276 ?        Sl   16:21   0:00 qemu-system-x86_64 -append /usr/bin/nginx  -cpu host,+x2apic,-pmu -daemonize -device pvpanic -device sga -display none -enable-kvm -kernel /home/kero/.local/share/kraftkit/runtime/e9da9bb7-5e1c-415c-bd58-3fd4cd2fd3b9/unikraft/bin/kernel -machine pc,accel=kvm -m size=64M -monitor unix:/home/kero/.local/share/kraftkit/runtime/e9da9bb7-5e1c-415c-bd58-3fd4cd2fd3b9/qemu_mon.sock,server,nowait -name e9da9bb7-5e1c-415c-bd58-3fd4cd2fd3b9 -nographic -no-reboot -S -parallel none -pidfile /home/kero/.local/share/kraftkit/runtime/e9da9bb7-5e1c-415c-bd58-3fd4cd2fd3b9/machine.pid -qmp unix:/home/kero/.local/share/kraftkit/runtime/e9da9bb7-5e1c-415c-bd58-3fd4cd2fd3b9/qemu_control.sock,server,nowait -qmp unix:/home/kero/.local/share/kraftkit/runtime/e9da9bb7-5e1c-415c-bd58-3fd4cd2fd3b9/qemu_events.sock,server,nowait -rtc base=utc -serial file:/home/kero/.local/share/kraftkit/runtime/e9da9bb7-5e1c-415c-bd58-3fd4cd2fd3b9/machine.log -smp cpus=1,threads=1,sockets=1 -vga none
308:kero       28074  0.0  0.0  12100  2688 pts/1    S+   16:21   0:00 grep -n --color qemu

Expected behavior

For the qemu process to be cleaned

Which architectures were you using or does this bug affect?

No response

Which operating system were you using or does this bug affect?

No response

Relevant log output

No response