Add Scope links from resource groups

[fbarl]

When browsing the K8s cluster, it would be nice if the resource groups like Nodes, Pods, etc.. themselves had a Open Weave Scope action (like the whole cluster and individual resources currently do).

I tried quickly to do this by adding

{
  "command": "scope.open",
  "when": "viewItem =~ /vsKubernetes\\.folder\\.resource/i"
},

in view/item/context section in package.json (also tried some other similar regexps), but it didn't seem to work. @squillace any idea what the matcher should be? 🤔