Add node labels to the NTH template

[JonTheNiceGuy]

Describe the feature
I would like to use node labels in the webhook template.

Is the feature request related to a problem?
We have added specific labels to the nodes to have a clearer understanding of what impact that node being terminated is, for example we have example.org/fqdn that is the FQDN of that node, or example.org/owner so we could notify the individual team if their node had gone down.

Describe alternatives you've considered
N/A