Do not close tabs on subscription change due to issues during restore…

… when expired subscription is found (#2522)

Task/Issue URL: https://app.asana.com/0/0/1206950879085056/f

**Description**:
Basically revert of
#2492 as it may lead to
crash.

**Steps to test this PR**:
Crash repro steps
1. Have Apple ID with expired or cancelled subscription
2. Try restore flow from the purchase page OR normal purchase
3. While the restoration is done we fetch the expired subscription,
insert it into cache, and this event causes all subscription tabs to
close
4. Closing tabs mid-purchase followed by interaction with alerts from
these tabs can lead to crash.


---
###### Internal references:
[Pull Request Review
Checklist](https://app.asana.com/0/1202500774821704/1203764234894239/f)
[Software Engineering
Expectations](https://app.asana.com/0/59792373528535/199064865822552)
[Technical Design
Template](https://app.asana.com/0/59792373528535/184709971311943)
[Pull Request
Documentation](https://app.asana.com/0/1202500774821704/1204012835277482/f)

Co-authored-by: Sam Symons <[email protected]>

DuckDuckGo/Tab/View/BrowserTabViewController.swift

@@ -163,10 +163,6 @@ final class BrowserTabViewController: NSViewController {
                                                selector: #selector(onSubscriptionAccountDidSignOut),
                                                name: .accountDidSignOut,
                                                object: nil)
-        NotificationCenter.default.addObserver(self,
-                                               selector: #selector(onSubscriptionDidChange),
-                                               name: .subscriptionDidChange,
-                                               object: nil)
 #endif
     }
 
@@ -258,25 +254,6 @@ final class BrowserTabViewController: NSViewController {
         }
     }
 
-    @objc
-    private func onSubscriptionDidChange(_ notification: Notification) {
-        guard let subscription = (notification.userInfo?[UserDefaultsCacheKey.subscription] as? DDGSubscription), !subscription.isActive else { return }
-
-        Task { @MainActor in
-            tabCollectionViewModel.removeAll { tabContent in
-                if case .subscription = tabContent {
-                    return true
-                } else if case .identityTheftRestoration = tabContent {
-                    return true
-                } else if case .dataBrokerProtection = tabContent {
-                    return true
-                } else {
-                    return false
-                }
-            }
-        }
-    }
-
 #endif
 
     private func subscribeToSelectedTabViewModel() {