Added a comment about slack message subtype and removed unused imports.

Author: ocielliottc

server/src/main/java/com/objectcomputing/checkins/services/slack/kudos/SlackKudosCreator.java

@@ -50,6 +50,7 @@ public class SlackKudosCreator {
 
     public void store(List<Message> messages) {
         for (Message message : messages) {
+            // User messages do not have a sub-type.
             if (message.getSubtype() == null) {
                 try {
                     AutomatedKudosDTO kudosDTO = createFromMessage(message);

server/src/test/java/com/objectcomputing/checkins/services/pulseresponse/PulseResponseControllerTest.java

@@ -33,9 +33,6 @@
 import java.util.UUID;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
-import javax.crypto.Mac;
-import javax.crypto.spec.SecretKeySpec;
-import java.nio.charset.StandardCharsets;
 import java.time.Instant;
 import java.net.URLEncoder;