[prometheus-node-exporter] SecurityContext unset by default

[flomontl]

Describe the bug a clear and concise description of what the bug is.

The container's capabilities are not set, and the default context containing unsafe capabilities, such as NET_RAW is used.

Remediation:

Please set this context:
securityContext:
capabilities:
drop:
- ALL

What's your helm version?

3.14.2

What's your kubectl version?

1.29

Which chart?

prometheus-node-exporter

What's the chart version?

1.7.0

What happened?

No response

What you expected to happen?

No response

How to reproduce it?

No response

Enter the changed values of values.yaml?

No response

Enter the command that you execute and failing/misfunctioning.

kubectl get pods -n prometheus -o=yaml

Anything else we need to know?

No response