Remove fixed nodeSelector label: kubernetes.io/os: linux

[AFMiziara]

Description

We are using computeClass from GCP to attach the resources from NRI charts. But we have an error:

["Key 'kubernetes.io/os' is not allowed with node selector; Custom Compute Classes can only be used along labels with keys: cloud.google.com/compute-class,topology.kubernetes.io/region,topology.kubernetes.io/zone,failure-domain.beta.kubernetes.io/region,failure-domain.beta.kubernetes.io/zone,cloud.google.com/gke-accelerator-count,cloud.google.com/gke-tpu-topology,cloud.google.com/gke-tpu-accelerator."]

Expected Behavior

It should be possible to not want to render the kubernetes.io/os: linux label in nodeSelector.

I really don't understand why this was done:

newrelic-prometheus-configurator/charts/newrelic-prometheus-agent/templates/statefulset.yaml

Lines 166 to 167 in fde1e5e

	nodeSelector:
	kubernetes.io/os: linux

If I want to explicitly set nodeSelector labels, the chart should not add any extra labels by default.