feat: Add attribute to allow specifyin deployment labels/annotations

[amisevsk]

What does this PR do?

Add attributes controller.devfile.io/deployment-labels and controller.devfile.io/deployment-annotations which can be used to specify labels and annotations to be applied to the workspace deployment

What issues does this PR fix or reference?

Closes #698

Is it tested? How?

To test, apply the DevWorkspace

cat <<EOF | kubectl apply -f -
apiVersion: workspace.devfile.io/v1alpha2
kind: DevWorkspace
metadata:
  name: plain
spec:
  routingClass: basic
  started: true
  template:
    attributes:
      controller.devfile.io/storage-type: ephemeral
      controller.devfile.io/deployment-labels: 
        my-label: foo
        my-other-label: bar
      controller.devfile.io/deployment-annotations: 
        my-attribute: foo
        my-other-attribute: bar
    components:
    - container:
        command:
        - tail
        - -f
        - /dev/null
        image: quay.io/amisevsk/web-terminal-tooling:dev
        memoryLimit: 512Mi
        mountSources: true
      name: web-terminal
EOF

PR Checklist

• E2E tests pass (when PR is ready, comment /test v8-devworkspace-operator-e2e, v8-che-happy-path to trigger)
  • v8-devworkspace-operator-e2e: DevWorkspace e2e test
  • v8-che-happy-path: Happy path for verification integration with Che

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: amisevsk, ibuziuk

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