fix: [SDK-4814] attribute Live Activity receive receipt to the delivered content

Read the notificationId from the content yielded by this contentUpdates
iteration instead of activity.content (the latest snapshot), which can
advance while the loop is suspended and mis-attribute the receipt to a
different update.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: nan-li

iOS_SDK/OneSignalSDK/OneSignalLiveActivities/Source/OneSignalLiveActivitiesManagerImpl.swift

@@ -334,7 +334,7 @@ public class OneSignalLiveActivitiesManagerImpl: NSObject, OSLiveActivities {
         Task {
             for await content in activity.contentUpdates {
                 // Don't track a live activity started / updated "in app" without a notification
-                if let notificationId = activity.content.state.onesignal?.notificationId {
+                if let notificationId = content.state.onesignal?.notificationId {
                     OneSignalLiveActivitiesManagerImpl.addReceiveReceipts(notificationId: notificationId, activityType: "\(activityType)", activityId: activity.attributes.onesignal.activityId)
                 }
             }