Stop relying on unstructured data in network performance KPI codebase

[hanamantagoudvk]

What would you like to be added:

Instead of operating on Unstructured items, we want to define our type the same way built-in APIs are defined,
Example:
https://github.com/kubernetes/sample-controller/blob/master/pkg/apis/samplecontroller/v1alpha1/types.go

In network_performance_measurement.go , we have a CR NetworkTestRequest update events being received.
These objects need to be handled using defined types , but instead of unstructured items.

Why is this needed:

Operating on unstructured (if not needed), isn't a good pattern - this code would be much simpler if operating on the type itself.

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[wojtek-t]

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