[Feature] Add node label for server health row

[StopMotionCuber]

When using this dashboard, I'm frequently in a situation where I would like to know which node a specific instance of the database is currently running on. This is easily inspected when doing some k8s debugging, but it would be good to have that on the dashboard directly.

I've implemented it on my end, and it looks like this:

To get everything still into a single line, I've removed some of the space from the gauge as well as the instance field. I'm doing a table query on kube_pod_info{namespace=~"$namespace",pod=~"$instances"} to fetch the information and displaying the node in the stats panel. I wanted to try submitting a PR for that, but when saving the panel I got ~900 changes, as .json is just not the best format for collaborative work. So would be nice if someone of the maintainers could consider adding this to the dashboard.