Update rock to `v3.0.0` and add tests

[NohaIhab]

closes #8

Manual testing

• clone this repo and checkout to the pr's branch
• build the rock with tox -e pack
• export the rock to docker with tox -e export-to-docker
• inject the image into the microk8s image cache

  docker save metacontroller:3.0.0 > mymeta.tar
  microk8s ctr image import mymeta.tar

• deploy this bundle.yaml with trust on top of juju and uk8s (with metacontroller using the rock):

  
  bundle: kubernetes
  name: test
  applications:
  admission-webhook: { charm: ch:admission-webhook, channel: latest/edge, scale: 1, trust: true }
  metacontroller-operator: { charm: ch:metacontroller-operator, channel: latest/edge, scale: 1, trust: true, options: { metacontroller-image: docker.io/library/metacontroller:3.0.0 } }
  minio:                   { charm: ch:minio, channel: latest/edge,       scale: 1 }
  kfp-profile-controller:  { charm: ch:kfp-profile-controller, channel: latest/edge, scale: 1, trust: true }
  kubeflow-profiles:  { charm: ch:kubeflow-profiles, channel: latest/edge, scale: 1, trust: true }
  relations:

• [kfp-profile-controller:object-storage, minio:object-storage]

• check the DecoratorController object was created

  kubectl get DecoratorController -n <namespace>

  you should see:

  NAME                                    AGE
  kubeflow-pipelines-profile-controller   8m2s

• create a profile

  kubectl apply -f - <<EOF
  apiVersion: kubeflow.org/v1
  kind: Profile
  metadata:
  name: profilename
  spec:
  owner:
  kind: User
  name: userid2@email.com
  EOF

• make sure the desired resources are created in the profile's namespace, find a list of the resources here