feat: Add relabelings config to ServiceMonitor resource

[thefirstofthe300]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Prometheus service discovery meta-labels __meta_kubernetes_* labels are not necessarily still attached to a metric when the metric_relabel_configs step is reached. Consequently, it is not possible to configure a label on pod as a metric tag using the chart solely. Adding the relabelings value to the ServiceMonitor will allow this use case.

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Added relabelings config for the ServiceMonitor to the Helm chart

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: thefirstofthe300
Once this PR has been reviewed and has the lgtm label, please assign gjtempleton for approval. For more information see the Kubernetes Code Review Process.

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[Shubham82]

/ok-to-test

[Shubham82]

/lgtm

Thanks @thefirstofthe300

[thefirstofthe300]

@gjtempleton @mwielgus Would you PTAL?