[DPG] Cant deserialize xml error response

[catalinaperalta]

Generated python using this spec: https://github.com/Azure/azure-rest-api-specs/tree/feature/blob-tsp/specification/storage/Microsoft.BlobStorage

While running some tests I noticed that we kept crashing when there was an error from the service. Seems we dont support xml error deserialization.

The line that is causing the error:

error = _deserialize(_models.StorageError, response.json())

Seems like we should be checking the content type in order to deserialize the error correctly.

Example crash:

(blobs) PS C:\Users\caperal\repos\azure-sdk-for-python\sdk\storage\azure-storage-blob\azure\storage\blob\_generated_patched> python .\test_xml.py
Traceback (most recent call last):
  File "C:\Users\caperal\repos\azure-sdk-for-python\sdk\storage\azure-storage-blob\azure\storage\blob\_generated_patched\test_xml.py", line 26, in <module>
    res = client.blob.query(
  File "C:\Users\caperal\repos\azure-sdk-for-python\sdk\core\azure-core\azure\core\tracing\decorator.py", line 105, in wrapper_use_tracer
    return func(*args, **kwargs)
  File "C:\Users\caperal\repos\azure-sdk-for-python\sdk\storage\azure-storage-blob\azure\storage\blob\_generated_patched\azure\storage\blob\operations\_operations.py", line 9816, in query
    error = _deserialize(_models.StorageError, response.json())
  File "C:\Users\caperal\repos\azure-sdk-for-python\sdk\core\azure-core\azure\core\rest\_http_response_impl.py", line 331, in json
    self._json = loads(self.text())
  File "C:\Python310\lib\json\__init__.py", line 346, in loads
    return _default_decoder.decode(s)
  File "C:\Python310\lib\json\decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "C:\Python310\lib\json\decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)