fix: fix human_readable for good

[Mishura4]

Example:

{
  "message": "Invalid Form Body",
  "code": 50035,
  "errors": {
    "data": {
      "poll": {
        "_errors": [
          {"code": "POLL_TYPE_QUESTION_ALLOWS_TEXT_ONLY", "message": "This poll type cannot include attachments, emoji or stickers with the question"}
        ]
      }
    }
  }
}

Currently the code assumes a _errors object either at the first or second level, this one is at the third level, so it wouldn't parse. This PR fixes that and adds handling of errors without an array: Error: 50035: Invalid Form Body - data.poll: This poll type cannot include attachments, emoji or stickers with the question (POLL_TYPE_QUESTION_ALLOWS_TEXT_ONLY)

Code change checklist

• I have ensured that all methods and functions are fully documented using doxygen style comments.
• My code follows the coding style guide.
• I tested that my change works before raising the PR.
• I have ensured that I did not break any existing API calls.
• I have not built my pull request using AI, a static analysis tool or similar without any human oversight.

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[github-actions]

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[Mishura4]

This might cause conflicts with #1126 but only because of indentation

[Mishura4]

This will now flat out just conflict with #1126