Print all validation errors in live_content_spec

The errors reported by RSpec are truncated by default. It's useful to
see all of them when there are any so you don't need to rerun the tests
after addressing each one

Author: yndajas

spec/integration/graphql/live_content_spec.rb

@@ -41,7 +41,7 @@
         parsed_response = JSON.parse(response.body)
         errors = JSON::Validator.fully_validate(schema, parsed_response)
 
-        expect(errors).to eql([])
+        expect(errors).to eql([]), errors.join("\n")
       end
     end
   end