Intents operator applies custom labels to pods when existing labels can be used

[orishoshan]

Is your feature request related to a problem? Please describe.
Today, the intents operator applies labels to pods in order to manage network policies and Istio authorization policies.
In many cases, these labels are not strictly necessary, as the labels used by the Deployment, StatefulSet, etc, resources that manage the pods can be reused, reducing label clutter and making it easier to understand which pods it's referring to.

Describe the solution you'd like
When possible, the intents operator should reuse existing pod labels.