[META][Kubernetes provider/Kubernetes module] Set watcher options node based on configuration

[constanca-m]

We need to do similar work for node as we did for namespace in this issue.

• [Beats] In beats, check node option is being taken into consideration. For example, the watcher is not using the node option for deployment:
  

  beats/libbeat/autodiscover/providers/kubernetes/pod.go

  Lines 128 to 133 in 269d319

  	if metaConf.Deployment {
  	replicaSetWatcher, err = kubernetes.NewNamedWatcher("resource_metadata_enricher_rs", client, &kubernetes.ReplicaSet{}, kubernetes.WatchOptions{
  	SyncTimeout: config.SyncPeriod,
  	Namespace: config.Namespace,
  	HonorReSyncs: true,
  	}, nil)

• [Beats] Check add_kubernetes_metadata node option as well
• [Beats] Update documentation
• [Elastic Agent] Check the Kubernetes provider uses the node option
• [Integrations] Put the node option at group level, similar as we did for namespace here.

[botelastic]

This issue doesn't have a Team:<team> label.

[botelastic]

Hi!
We just realized that we haven't looked into this issue in a while. We're sorry!

We're labeling this issue as Stale to make it hit our filters and make sure we get back to it as soon as possible. In the meantime, it'd be extremely helpful if you could take a look at it as well and confirm its relevance. A simple comment with a nice emoji will be enough :+1.
Thank you for your contribution!