chore: update editedBy when the user changes their username (following BE rules) (#31098)

apps/meteor/client/startup/notifications/usersNameChanged.ts

@@ -23,6 +23,20 @@ Meteor.startup(() => {
 			},
 		);
 
+		Messages.update(
+			{
+				'editedBy._id': _id,
+			},
+			{
+				$set: {
+					'editedBy.username': username,
+				},
+			},
+			{
+				multi: true,
+			},
+		);
+
 		Messages.update(
 			{
 				mentions: {