DEV: Stop logging error response body in FileHelper (#17120)

This doesn't cope well with gzipped, binary, or large responses. Ideally we would teach FinalDestination to safely retrieve and decode some of the response body. But for now, let's remove the broken implementation.

lib/file_helper.rb

@@ -73,7 +73,7 @@ class FileHelper
             # attempt error API compatibility
             io = FakeIO.new
             io.status = [response.code, ""]
-            raise OpenURI::HTTPError.new("#{response.code} Error: #{response.body}", io)
+            raise OpenURI::HTTPError.new("#{response.code} Error", io)
           else
             log(:error, "FinalDestination did not work for: #{url}") if verbose
             throw :done

spec/lib/file_helper_spec.rb

@@ -29,7 +29,7 @@ describe FileHelper do
           expect(e.io.status[0]).to eq("404")
           raise
         end
-      end.to raise_error(OpenURI::HTTPError, "404 Error: 404")
+      end.to raise_error(OpenURI::HTTPError, "404 Error")
     end
 
     it "does not follow redirects if instructed not to" do