xds: Only the node id should be logged, not the full node

[ejona86]

As seen in #5020 (comment):

2022/05/20 12:40:32 could not greet: rpc error: code = Unavailable desc = name resolver error: xds: ListenerResource target localhost:50051 not found, watcher timeout, xDS client nodeID: id:"projects/5/networks/default/nodes/fcee1e8b-301c-4cbe-adfd-44a694972a27" cluster:"cluster" metadata:{fields:{key:"INSTANCE_IP" value:{string_value:"10.0.2.100"}} fields:{key:"TRAFFICDIRECTOR_GCP_PROJECT_NUMBER" value:{string_value:"5"}} fields:{key:"TRAFFICDIRECTOR_NETWORK_NAME" value:{string_value:"default"}}} locality:{} user_agent_name:"gRPC Go" user_agent_version:"1.47.0-dev" client_features:"envoy.lb.does_not_support_overprovisioning" client_features:"xds.config.resource-in-sotw"

xds client was correctly updated to include the node id ("projects/5/networks/default/nodes/fcee1e8b-301c-4cbe-adfd-44a694972a27") in the error message, but it also includes all the other node information. That is a lot of noise and not what was designed.