Read a frozen extraction plan and current status

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{
  "counts": {
    "additionally_affected": 123,
    "diffs": "<string>",
    "required": 123,
    "selected": 123
  },
  "created_at": "2023-11-07T05:31:56Z",
  "entities": [
    {
      "entity_id": "<string>",
      "reason_entity_id": "<string>",
      "role": "selected"
    }
  ],
  "expires_at": "2023-11-07T05:31:56Z",
  "id": "<string>",
  "project_id": "<string>",
  "proposed_destination_name": "<string>",
  "selector": "entities",
  "source_branch_id": "<string>",
  "source_snapshot_seq_id": "<string>",
  "status": "ready"
}