only dm original user entities

Signed-off-by: Kai Dubauskas <kai.dubauskas@doordash.com>

.changeset/curvy-socks-punch.md

@@ -1,5 +1,5 @@
 ---
-'@backstage/plugin-notifications-backend-module-slack': patch
+'@backstage/plugin-notifications-backend-module-slack': minor
 ---
 
-Fix skipped slack DMS for users when a group entity is a recipient
+**BREAKING**: Notifications sent to non-user entities no longer send Slack DMs to resolved users.

plugins/notifications-backend-module-slack/src/lib/SlackNotificationProcessor.ts

@@ -281,11 +281,8 @@ export class SlackNotificationProcessor implements NotificationProcessor {
         parseEntityRef(notification.user),
       );
 
-      if (
-        entityRefs.some(e => parseEntityRef(e).kind === 'group') &&
-        !explicitUserEntityRefs.includes(normalizedUserRef)
-      ) {
-        // This user was resolved from a non-user entity and we've already sent a group channel message.
+      if (!explicitUserEntityRefs.includes(normalizedUserRef)) {
+        // This user was resolved from a non-user entity. Skip sending aDM.
         return;
       }