Key backup returns (#1951)

* Converge on UserSessionFlowCoordinator logout confirmation

* Add logout confirmation screen strings to untranslated.

* Fix chat backup learn more URl fragment.

* Implement logout flows that check recovery and key backup for the last session

* Move logout confirmation screen strings to localazy

* Change encrypted timeline item copy to "Waiting for decryption key"

* Use different encrypted history banner based on key backup states

* Introduce a SettingsFlowCoordinator and implement navigation directly to the secure backup screen from the logout flows.

* Fix **mocked** secure backup controller flows

* Simplify encrypted history banner logic

* Address PR comments

ElementX/Sources/Screens/HomeScreen/HomeScreenCoordinator.swift

@@ -34,7 +34,7 @@ enum HomeScreenCoordinatorAction {
     case presentSessionVerificationScreen
     case presentStartChatScreen
     case presentInvitesScreen
-    case signOut
+    case logout
 }
 
 final class HomeScreenCoordinator: CoordinatorProtocol {
@@ -75,8 +75,8 @@ final class HomeScreenCoordinator: CoordinatorProtocol {
                     actionsSubject.send(.presentSettingsScreen)
                 case .presentSessionVerificationScreen:
                     actionsSubject.send(.presentSessionVerificationScreen)
-                case .signOut:
-                    actionsSubject.send(.signOut)
+                case .logout:
+                    actionsSubject.send(.logout)
                 case .presentStartChatScreen:
                     actionsSubject.send(.presentStartChatScreen)
                 case .presentInvitesScreen: