As a user I want to know that my multi-resource editor successfully created the resource

[adietish]

related to #658

In #658 we re-introduced the notification for a single-resource editor which tells the user that the resource was successfully created. We're still missing this for the multi-resource editor.

Steps:

1. EXEC: open the following in an editor:

   kind: Deployment
   apiVersion: apps/v1
   metadata:
   name: numberguess
   spec:
   replicas: 1
   selector:
   matchLabels:
     app: numberguess
   template:
   metadata:
     labels:
       app: numberguess
   spec:
     containers:
       - name: my-numberguess
         image: numberguess:latest
         ports:
           - name: http
             containerPort: 8081
             protocol: TCP
         resources:
           limits:
             memory: "1024Mi"
             cpu: "500m"
   ---
   kind: Service
   apiVersion: v1
   metadata:
   name: numberguess-svc
   spec:
   ports:
   - name: http-8081
     port: 8081
     protocol: TCP
     targetPort: 8081
   selector:
   app: numberguess

2. EXEC: push the editor to the cluster
3. ASSERT: the resources were successfully created

Result: Nothing happens. There's no notification that tells you that the resource were successfully created. You only get a notification if something goes wrong and resources could not get created

Expected result: I want to be informed that the resources were created on the cluster. Of course I'd also like to know of errors. So the notification should inform of both: success and errors. It's currently not evident how to inform properly as notifications currently only have single line and a single icon: they either inform of success (for the single resource editor) or errors (for both, the single resource editor or the multi resource editor)