Re-prompt for crash reporting (#3595)

Task/Issue URL:
https://app.asana.com/0/1208592102886666/1208630312625695/f
Tech Design URL:
https://app.asana.com/0/1208592102886666/1208660326715650/f

**Description**:
- Introduce a feature flag for use with this project overall, currently
set to internal only
- Introduce a new UserDefaults value
(```crashCollectionShouldRevertOptedInStatusTrigger```) that can be used
to force the client to revert the existing
```crashCollectionOptInStatus``` to .unknown, only if the value is
currently .optedIn. This new trigger is implemented as an Int, so that
we can ensure the user’s Opt-In state will be reverted only once after
the feature is turned on. In the future if we need this functionality
again, we’d simply bump the garget value and the opt-in state would be
reset again.

See asana task for specific requirements, and the parent project for
more context if necessary.

Core/FeatureFlag.swift

@@ -53,6 +53,9 @@ public enum FeatureFlag: String {
 
     /// https://app.asana.com/0/72649045549333/1208617860225199/f
     case networkProtectionEnforceRoutes
+
+    /// https://app.asana.com/0/1208592102886666/1208613627589762/f
+    case crashReportOptInStatusResetting
 }
 
 extension FeatureFlag: FeatureFlagDescribing {
@@ -118,6 +121,8 @@ extension FeatureFlag: FeatureFlagDescribing {
             return .remoteDevelopment(.subfeature(NetworkProtectionSubfeature.enforceRoutes))
         case .adAttributionReporting:
             return .remoteReleasable(.feature(.adAttributionReporting))
+        case .crashReportOptInStatusResetting:
+            return .internalOnly
         }
     }
 }

DuckDuckGo/AppSettings.swift

@@ -79,6 +79,7 @@ protocol AppSettings: AnyObject, AppDebugSettings {
     var autoconsentEnabled: Bool { get set }
 
     var crashCollectionOptInStatus: CrashCollectionOptInStatus { get set }
+    var crashCollectionShouldRevertOptedInStatusTrigger: Int { get set }
 
     var duckPlayerMode: DuckPlayerMode { get set }
     var duckPlayerAskModeOverlayHidden: Bool { get set }

DuckDuckGo/AppUserDefaults.swift

@@ -75,6 +75,7 @@ public class AppUserDefaults: AppSettings {
         static let favoritesDisplayMode = "com.duckduckgo.ios.favoritesDisplayMode"
 
         static let crashCollectionOptInStatus = "com.duckduckgo.ios.crashCollectionOptInStatus"
+        static let crashCollectionShouldRevertOptedInStatusTrigger = "com.duckduckgo.ios.crashCollectionShouldRevertOptedInStatusTrigger"
 
         static let duckPlayerMode = "com.duckduckgo.ios.duckPlayerMode"
         static let duckPlayerAskModeOverlayHidden = "com.duckduckgo.ios.duckPlayerAskModeOverlayHidden"
@@ -399,6 +400,19 @@ public class AppUserDefaults: AppSettings {
         }
     }
 
+    var crashCollectionShouldRevertOptedInStatusTrigger: Int {
+        get {
+            if let resetTrigger = userDefaults?.integer(forKey: Keys.crashCollectionShouldRevertOptedInStatusTrigger) {
+                return resetTrigger
+            } else {
+                return 0
+            }
+        }
+        set {
+            userDefaults?.setValue(newValue, forKey: Keys.crashCollectionShouldRevertOptedInStatusTrigger)
+        }
+    }
+
     var duckPlayerMode: DuckPlayerMode {
         get {
             if let value = userDefaults?.string(forKey: Keys.duckPlayerMode),

DuckDuckGo/CrashCollectionOnboarding.swift

@@ -20,6 +20,7 @@
 import Combine
 import Foundation
 import SwiftUI
+import BrowserServicesKit
 
 enum CrashCollectionOptInStatus: String {
     case undetermined, optedIn, optedOut
@@ -35,16 +36,33 @@ final class CrashCollectionOnboardingViewController: UIHostingController<CrashCo
 }
 
 final class CrashCollectionOnboarding: NSObject {
+
+    private var featureFlagger: FeatureFlagger
 
-    init(appSettings: AppSettings) {
+    init(appSettings: AppSettings,
+         featureFlagger: FeatureFlagger = AppDependencyProvider.shared.featureFlagger) {
         self.appSettings = appSettings
         self.viewModel = CrashCollectionOnboardingViewModel(appSettings: appSettings)
+        self.featureFlagger = featureFlagger
         super.init()
     }
+
+    // If the user's crash report opt in status should be reset to unknown upon next release,
+    // increment this value by 1
+    private let crashCollectionShouldRevertOptedInStatusTriggerTargetValue: Int = 1
 
     @MainActor
     func presentOnboardingIfNeeded(for payloads: [Data], from viewController: UIViewController, sendReport: @escaping () -> Void) {
         let isCurrentlyPresenting = viewController.presentedViewController != nil
+
+        if featureFlagger.isFeatureOn(.crashReportOptInStatusResetting) {
+            if appSettings.crashCollectionOptInStatus == .optedIn &&
+                appSettings.crashCollectionShouldRevertOptedInStatusTrigger < crashCollectionShouldRevertOptedInStatusTriggerTargetValue {
+                appSettings.crashCollectionOptInStatus = .undetermined
+                appSettings.crashCollectionShouldRevertOptedInStatusTrigger = crashCollectionShouldRevertOptedInStatusTriggerTargetValue
+            }
+        }
+
         guard shouldPresentOnboarding, !isCurrentlyPresenting else {
             if appSettings.crashCollectionOptInStatus == .optedIn {
                 sendReport()

DuckDuckGoTests/AppSettingsMock.swift

@@ -82,6 +82,8 @@ class AppSettingsMock: AppSettings {
     var autoconsentEnabled = true
 
     var crashCollectionOptInStatus: CrashCollectionOptInStatus = .undetermined
+
+    var crashCollectionShouldRevertOptedInStatusTrigger: Int = 0
 
     var newTabPageSectionsEnabled: Bool = false