Handling for non-json response

[AyushSawant18588]

Describe the change
Since the original error response is included in the body field of openai.RequestError, even when the response is not in JSON format, it would be more appropriate to return openai.RequestError directly, rather than returning an errorString. This approach ensures that the original error details are preserved within the body field.

Describe your solution
Removed the condition that checked if the response was in a non-JSON format and returned an errorString with the original error response. Now, the original error response will be directly included in the body field of openai.RequestError.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.04%. Comparing base (774fc9d) to head (22cf414).
Report is 64 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #881      +/-   ##
==========================================
+ Coverage   98.46%   99.04%   +0.58%     
==========================================
  Files          24       26       +2     
  Lines        1364     1460      +96     
==========================================
+ Hits         1343     1446     +103     
+ Misses         15        8       -7     
  Partials        6        6              

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