Add --property=Delegate=yes to systemd-run command

[benzea]

#2981 adds documentation to run kind using systemd-run. However, it is missing --property=Delegate=yes which should be added.

I think you should be setting Delegate=yes if a (sub-)process is managing a subhierarchy of cgroups. Even if it might work without it, setting the property is more correct and the documentation should say to do it. I have not looked into when/why it is working fine without Delegate=yes, I suppose it might be expected to work because the user has access to their cgroup hierarchy anyway. But, it seems to me that adding it is more correct.

I think we are in the i-like-islands case as mentioned in https://systemd.io/CGROUP_DELEGATION/#three-scenarios