Separate summary endpoint for validation status

[Tooseriuz]

✅ DoD

• [x] Resolves #570
• [x] API docs updated na
• [x] Release notes updated na
• [x] Unit or integration tests added na

(use na when API docs (Release notes, etc) do not need to be updated)

📝 Summary

• new GET /classifier-job/:id/validation return

  {
  "reviewStatus": {
      "total": 1467,
      "confirmed": 914,
      "rejected": 71,
      "uncertain": 265
  }
  }

• old GET /classifier-job/:id/summary return

  {
  "classificationsSummary": [
      {
          "value": "gunshot",
          "title": "Gunshot, gunfire",
          "image": null,
          "total": 7,
          "confirmed": 2,
          "rejected": 1,
          "uncertain": 1
      },
      {
          "value": "live",
          "title": "Live",
          "image": null,
          "total": 20,
          "confirmed": 5,
          "rejected": 6,
          "uncertain": 7
      }
  ]
  }