feat(ws): Notebooks 2.0 // Backend// Add missing field

[yehudit1987]

This PR is for adding missing ports field to workspace model.

[google-oss-prow]

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[thesuperzapper]

/ok-to-test

[thesuperzapper]

@yehudit1987 it might be more useful for the frontend if we do something more abstract like "services" (which initially only includes "HTTP" type services).

That makes it a bit easier to populate the front-end "connect" box, because rather than constructing the HTTP path in the front end we could just include the httpPath (relative to the UI base, not absolute) rather than constructing it in the front end.

Also, stuff like "port number" don't need to be included because this is hidden from the end user.

For example (written in YAML for clarity, but payload is JSON in app):

...
  services:
    - httpService:
       displayName: "XXXXX"
       httpPath: "/workspace/{namespace}/{workspace_name}/{port_id}/