Apply default best practices helm chart labels to all objects we create

[yuvipanda]

https://helm.sh/docs/chart_best_practices/labels/#standard-labels lists some best practices labels all objects created with a helm chart should have. This chart doesn't have them, making management difficult. For example, I can get the name of the pod that is created by prometheus with POD_NAME="$(k -n support get pod -l app.kubernetes.io/name=prometheus -o name)" because of the standard label.

This chart should have such standard labels added