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Add resourceName field to the NetworkSelectionElement

The resource pool a network attachment should use is normally selected
with the `k8s.v1.cni.cncf.io/resourceName` annotation on the
NetworkAttachmentDefinition.
The same selection can instead be set per attachment in the network
selection element by adding `"resourceName": "<resource>"`.
This lets attachments backed by different resource pools reference the
same NetworkAttachmentDefinition, without creating a separate
NetworkAttachmentDefinition per resource pool.
NAD still should set alowed resourceNames, which is similar to
creating multiple NADs with different resourceNames.

Signed-off-by: Nadia Pinaeva <n.m.pinaeva@gmail.com>