Wrap non-JSON responses in json error response

[chadicus]

What does this PR do?

This pull request updates the GuzzleAdapter to check the HTTP response for valid JSON. Before if the response was not valid json an exception was thrown. This change will intercept the non-JSON response and return an error formatted json response containing the original non-JSON response. This will maintain the original returned API status code as well

Checklist

• Pull request contains a clear definition of changes
• Tests (either unit, integration, or acceptance) written and passing
• Relevant documentation produced and/or updated

[chrisryan]

Changes make sense. We should tag this as a potentially backwards breaking change. It also looks like the builds may need to be updated.