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/HomeScreenModels.swift

@@ -27,13 +27,13 @@ enum HomeScreenViewModelAction {
     case presentFeedbackScreen
     case presentStartChatScreen
     case presentInvitesScreen
-    case signOut
+    case logout
 }
 
 enum HomeScreenViewUserMenuAction {
     case settings
     case feedback
-    case signOut
+    case logout
 }
 
 enum HomeScreenViewAction {