when running for a PR, improve in-issue reporting

[mockersf]

• when triggering for a PR, add a nonce as metadata to every pixel eagle run
• once done, call api https://pixel-eagle.com/B25A040A-A980-4602-B90C-D480AB84076D/runs\?filter=nonce={nonce}
• for every run, there will be an entry of the form

  {
    "project_id": "b25a040a-a980-4602-b90c-d480ab84076d",
    "id": 7563,
    "timestamp": 1737953544,
    "metadata": {
      "os": "macOS",
      "branch": "PR-17413",
      "gitref": "6911ddfd4b2d0f9efa6adba1605736112f7ef4f4"
      "nonce": "{nonce}",
    },
    "screenshot_count": 266,
    "compared_with": {
      "id": 7560,
      "changed": 8,
      "missing": 0
    }
  }

• the counts in compared_with are done with a 0% tolerance and may not be the actual ones
• to get the actual result, call https://pixel-eagle.com/B25A040A-A980-4602-B90C-D480AB84076D/runs/{id}/compare/{compared_with.id}

• add nonce
• call the list run API and report for every run
• if there are diffs, check the actual results of the run