Add possibility do add common labels in helm chart

[Rohlik]

Is your feature request related to a problem? Please describe.
There is no way how to easily set common labels across all Helm chart Tempo created resources, like (deployments, statefulsets, ingresses, services, servicemonitors, persistent volumes, etc). This leads to difficulties when you have common rules/alerts, for example, "almost full persistent volume" and you want to route them to the responsible owner based on the team label. This is now impossible as the PV/PVC doesn't have related labels 😢.

Describe the solution you'd like
In values.yaml, we should be able to specify something like this:

commonLabels:
  foo: bar
  label2: value2

and all resources created by the Tempo chart will have those labels.

Describe alternatives you've considered

Additional context
Sadly, the other components from Grafana are missing this support also 😣; see tickets below. It would be nice to have the same method for setting these common labels across charts.

• Add possibility do add common labels in helm chart mimir#9067
• No longer possible to add labels to all loki created objects in kubernetes with the new helm chart. loki#8819

[joe-elliott]

I am fully in support of this. Moving this to the helm charts repo for visibility.

We would gladly take a PR to add this feature.