Handle cloud.google.com/gke-dpv2-unified-cni node label

[jingyuanliang]

Skip CNI config file writing when the node label is set to true and Cilium CNI is being used (to be handed over to anetd; include "natural" DPv2 and migrated nodes during DPv2 migration).

/assign @sugangli @pravk03 @sypakine

[google-oss-prow]

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In response to this:

Skip CNI config file writing when the node label is set to true and Cilium CNI is being used (to be handed over to anetd; include "natural" DPv2 and migrated nodes during DPv2 migration).

/assign @sugangli @pravk03 @sypakine

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[google-oss-prow]

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