[Helm] Updated pod labels to include all standard k8s labels and updated hel…

[jimmybchopps]

• Updated labels to use common kubernetes labels on pods (previously it was only on statefulset and several were missing from pod) to increase traceability throughout the application.
• Added helm unittests to check for updated labels in addition to the podLabels that can be provided via values.yaml file
• Ran make helm-test to validate changes and updates to test

[thbkrkr]

We use the operator Helm chart to generate the YAML manifests that allow the operator to be installed without Helm.

Check https://www.elastic.co/guide/en/cloud-on-k8s/current/k8s-installing-eck.html:

# Install without Helm
kubectl create -f https://download.elastic.co/downloads/eck/2.15.0/crds.yaml
kubectl apply -f https://download.elastic.co/downloads/eck/2.15.0/operator.yaml // <-- operator YAML manifest

You can call the generation via make generate. The operator YAML manifest is then written in ./config/operator.yaml.

One issue with your change is that we end up with "Helm" bits in this YAML manifest.

> make generate
> cat config/operator.yaml | grep -i helm
        helm.sh/chart: eck-operator-2.16.0-SNAPSHOT
        app.kubernetes.io/managed-by: Helm

[jimmybchopps]

@thbkrkr I see, I'll rework the solution and test it out using make generate to make sure this is resolved.