This was primarily intended as a work specific to UDN (via NETOBSERV-1904) but ended up with a broader scope, not feature-gated for UDN, because it also applies to Secondary Interfaces (multus etc.)

The fields SrcK8S_NetworkName and DstK8S_NetworkName did already exist but weren't "promoted" as regular columns and filters

Now they are.

On top of that, they can be used as topology Scopes and Groups, and Overview Scopes, but this is currently still bound to the UDN feature gate (we could think about making it available when secondary interfaces are detected, too)

In the case of Secondary Networks, the NetworkName that will be displayed corresponds to the name visible in the k8s network-status annotation.