[promtail] Add common version label to daemonset pods #3456
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What this PR does / why we need it:
It adds common labels to metadata labels in the pod spec. The main reasoning is to persist the app.kubernetes.io/version and app.kubernetes.io/name labels to the pod for standardization. Per docs, (https://kubernetes.io/docs/concepts/overview/working-with-objects/common-labels/#labels) "In order to take full advantage of using these labels, they should be applied on every resource object.".
Improves traceability throughout the application. Ex. via Kiali dashboard.
Which issue(s) this PR fixes (optional, in fixes #(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
N/A