[core-client] Check response body for error details even without default body mapper #33151
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Currently, when we receive an error response and there is no default body mapper, we immediately throw a
RestError without further inspecting the response body. It's ideal for operation specifications to define a
default mapper for unexpected responses. However, some services did not implement this leading to issues like
#33035 where the error message contains a JSON string of the
error object, and the error code is undefined.
This PR modifies the behavior to look into parsedBody if it has an 'error' property that contains both
'code' and 'message' properties, improving the developer experience in this scenario.