Remove the room list notification count feature flag.

The room list now always shows the unread notification count for highlighted rooms
and the app icon badge always uses the SDK's own unread notification count, both in
the app and in the NSE. The push payload's unread count is no longer used, so its
UNNotificationContent helper and user info key have been removed along with the
setting, its developer options toggle and the feature-disabled unit test.

ElementX/Sources/Services/Notification/Manager/NotificationManager.swift

@@ -159,7 +159,7 @@ final class NotificationManager: NSObject, NotificationManagerProtocol {
     }
     
     func updateAppBadgeCount() async {
-        guard let userSession, appSettings.roomListNotificationCountEnabled else { return }
+        guard let userSession else { return }
         
         let badgeCount = Int(userSession.clientProxy.totalUnreadNotifications)
         

ElementX/Sources/Services/Notification/NotificationConstants.swift

@@ -13,7 +13,6 @@ nonisolated enum NotificationConstants {
         static let roomIdentifier = "room_id"
         static let eventIdentifier = "event_id"
         static let threadRootEventIdentifier = "thread_root_event_id"
-        static let unreadCount = "unread_count"
         static let pusherNotificationClientIdentifier = "pusher_notification_client_identifier"
         static let receiverIdentifier = "receiver_id"
     }