fix(message): remove standalone MessagePromotion export (#3180)

* fix(message): remove MessagePromotion export

* chore(message): changeset

Author: stephl3

.changeset/rude-rockets-crash.md

@@ -0,0 +1,5 @@
+---
+'@lg-chat/message': patch
+---
+
+Remove `MessagePromotion` export

chat/message/src/index.ts

@@ -32,7 +32,4 @@ export {
   MessageLinks,
   type MessageLinksProps,
 } from './MessageLinks';
-export {
-  MessagePromotion,
-  type MessagePromotionProps,
-} from './MessagePromotion';
+export { type MessagePromotionProps } from './MessagePromotion';