Update Unattributed Time Processor to use new methods

* The time processor will not handle its own background task.
* The ordering will be correct when the app is backgrounded. This time is sent to the user manager who enqueues a delta with the session time. Then the Operation Repo will start its background task and flush deltas.

Author: nan-li

iOS_SDK/OneSignalSDK/OneSignalCore/Source/OneSignalCommonDefines.h

@@ -192,7 +192,6 @@ typedef enum {ATTRIBUTED, NOT_ATTRIBUTED} FocusAttributionState;
 
 // OneSignal Background Task Identifiers
 #define ATTRIBUTED_FOCUS_TASK                   @"ATTRIBUTED_FOCUS_TASK"
-#define UNATTRIBUTED_FOCUS_TASK                 @"UNATTRIBUTED_FOCUS_TASK"
 #define SEND_SESSION_TIME_TO_USER_TASK          @"SEND_SESSION_TIME_TO_USER_TASK"
 #define OPERATION_REPO_BACKGROUND_TASK          @"OPERATION_REPO_BACKGROUND_TASK"
 #define IDENTITY_EXECUTOR_BACKGROUND_TASK       @"IDENTITY_EXECUTOR_BACKGROUND_TASK_"

iOS_SDK/OneSignalSDK/Source/OSUnattributedFocusTimeProcessor.m

@@ -36,7 +36,6 @@ @implementation OSUnattributedFocusTimeProcessor
 
 - (instancetype)init {
     self = [super init];
-    [OSBackgroundTaskManager setTaskInvalid:UNATTRIBUTED_FOCUS_TASK];
     return self;
 }
 
@@ -71,21 +70,9 @@ - (void)sendUnsentActiveTime:(OSFocusCallParams *)params {
 }
 
 - (void)sendOnFocusCallWithParams:(OSFocusCallParams *)params totalTimeActive:(NSTimeInterval)totalTimeActive {
-    // should dispatch_async?
-    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
-        [OSBackgroundTaskManager beginBackgroundTask:UNATTRIBUTED_FOCUS_TASK];
-        
-        [OneSignalLog onesignalLog:ONE_S_LL_DEBUG message:@"OSUnattributedFocusTimeProcessor:sendOnFocusCallWithParams start"];
-        
-        [OneSignalUserManagerImpl.sharedInstance updateSessionWithSessionCount:nil sessionTime:@(totalTimeActive) refreshDeviceMetadata:false sendImmediately:true onSuccess:^{
-            [super saveUnsentActiveTime:0];
-            [OneSignalLog onesignalLog:ONE_S_LL_DEBUG message:@"sendOnFocusCallWithParams unattributed succeed, saveUnsentActiveTime with 0"];
-            [OSBackgroundTaskManager endBackgroundTask:UNATTRIBUTED_FOCUS_TASK];
-        } onFailure:^{
-            [OneSignalLog onesignalLog:ONE_S_LL_WARN message:@"sendOnFocusCallWithParams unattributed failed, will retry on next open"];
-            [OSBackgroundTaskManager endBackgroundTask:UNATTRIBUTED_FOCUS_TASK];
-        }];
-    });
+    [OneSignalLog onesignalLog:ONE_S_LL_DEBUG message:[NSString stringWithFormat:@"OSUnattributedFocusTimeProcessor:sendSessionTime of %@", @(totalTimeActive)]];
+    [OneSignalUserManagerImpl.sharedInstance sendSessionTime:@(totalTimeActive)];
+    [super saveUnsentActiveTime:0];
 }
 
 - (void)cancelDelayedJob {