Fix #8673: Move NTP P3A helper creation outside of NTP (#8676)

There was a chance that a user would simply never load a NTP during their session which means that P3A rotations wouldn't trigger new NTP-SI reports each day. This report was supposed to occur each rotation, not specifically per NTP view.

Sources/Brave/Frontend/Browser/BrowserViewController/BrowserViewController.swift

@@ -270,6 +270,8 @@ public class BrowserViewController: UIViewController {
 
   /// In app purchase obsever for VPN Subscription action
   let iapObserver: IAPObserver
+
+  private let ntpP3AHelper: NewTabPageP3AHelper
 
   public init(
     windowId: UUID,
@@ -334,6 +336,7 @@ public class BrowserViewController: UIViewController {
     }
 
     iapObserver = BraveVPN.iapObserver
+    ntpP3AHelper = .init(p3aUtils: braveCore.p3aUtils)
 
     super.init(nibName: nil, bundle: nil)
     didInit()
@@ -1419,7 +1422,7 @@ public class BrowserViewController: UIViewController {
         feedDataSource: feedDataSource,
         rewards: rewards,
         privateBrowsingManager: privateBrowsingManager,
-        p3aUtils: braveCore.p3aUtils
+        p3aHelper: ntpP3AHelper
       )
       // Donate NewTabPage Activity For Custom Suggestions
       let newTabPageActivity =

Sources/Brave/Frontend/Browser/New Tab Page/NewTabPageViewController.swift

@@ -140,14 +140,14 @@ class NewTabPageViewController: UIViewController {
     feedDataSource: FeedDataSource,
     rewards: BraveRewards,
     privateBrowsingManager: PrivateBrowsingManager,
-    p3aUtils: BraveP3AUtils
+    p3aHelper: NewTabPageP3AHelper
   ) {
     self.tab = tab
     self.rewards = rewards
     self.feedDataSource = feedDataSource
     self.privateBrowsingManager = privateBrowsingManager
     self.backgroundButtonsView = NewTabPageBackgroundButtonsView(privateBrowsingManager: privateBrowsingManager)
-    self.p3aHelper = .init(p3aUtils: p3aUtils)
+    self.p3aHelper = p3aHelper
     background = NewTabPageBackground(dataSource: dataSource)
     notifications = NewTabPageNotifications(rewards: rewards)
     collectionView = NewTabCollectionView(frame: .zero, collectionViewLayout: layout)