Implement support for some basic embed options for work sheets via LTI

This commit also fixes an issue with the flash messages being positioned too high and displayed for too long

app/controllers/concerns/submission_scoring.rb

@@ -55,6 +55,11 @@ module SubmissionScoring
         }
       end
     end
+    if @embed_options.present? && @embed_options[:hide_test_results] && outputs.present?
+      outputs.each do |output|
+        output.except!(:error_messages, :count, :failed, :filename, :message, :passed, :stderr, :stdout)
+      end
+    end
     outputs
   end
 end