LLM critic validator enhancement

[rkritika1508]

Describe the bug
A clear and concise description of what the bug is.
On calling LLM critic validator, sometimes we get responses like -

{
  "success": false,
  "data": {
    "response_id": "11c2d6b7-6f2e-4d09-a78a-23b3d40aed6b",
    "rephrase_needed": false
  },
  "error": "The response failed the following metrics: ['query']."
}

And sometimes like this -

{
  "success": false,
  "data": {
    "response_id": "4985fe71-39fb-42d4-977c-d2d27a16f2d6",
    "rephrase_needed": false
  },
  "error": "The response is missing or has invalid evaluations for the following metrics: ['query']."
}

Investigate why that happens and override the errors for the validator
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