feat(verification): option to verify bundle server side in WorkflowRun/View endpoint

[jiparis]

This PR introduces a new parameter (Verify: true) in the request to perform bundle verification on WorkfloRun/View endpoint.
Note this is just a convenience and doesn't replace client side validation.
Refs #914

> buf curl --http2-prior-knowledge --protocol grpc  -H "Authorization: Bearer $CHAINLOOP_TOKEN" -d '{"id":"844be0a2-f6cd-4c4b-9187-b8496b11a86c", "verify":true}' http://localhost:9000/controlplane.v1.WorkflowRunService/View
...    },
    "verification": {
      "verified": true
    }
  }
}

[migmartri]

Thanks @jiparis

I put inline one question about knowing how this code behaves with old attestations that don't have bundle