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/Services/SecureBackup/SecureBackupController.swift

@@ -29,6 +29,11 @@ class SecureBackupController: SecureBackupControllerProtocol {
         keyBackupStateSubject.asCurrentValuePublisher()
     }
     
+    var isLastSession: Bool {
+        #warning("FIXME")
+        return true
+    }
+    
     func enableBackup() async -> Result<Void, SecureBackupControllerError> {
         keyBackupStateSubject.send(.enabling)
         
@@ -76,4 +81,8 @@ class SecureBackupController: SecureBackupControllerProtocol {
         
         return .success(())
     }
+    
+    func waitForKeyBackup() async {
+        try? await Task.sleep(for: .seconds(5))
+    }
 }

ElementX/Sources/Services/SecureBackup/SecureBackupControllerProtocol.swift

@@ -49,11 +49,15 @@ protocol SecureBackupControllerProtocol {
     
     var keyBackupState: CurrentValuePublisher<SecureBackupKeyBackupState, Never> { get }
     
+    var isLastSession: Bool { get }
+    
     func enableBackup() async -> Result<Void, SecureBackupControllerError>
     func disableBackup() async -> Result<Void, SecureBackupControllerError>
     
     func generateRecoveryKey() async -> Result<String, SecureBackupControllerError>
     func confirmRecoveryKey(_ key: String) async -> Result<Void, SecureBackupControllerError>
+    
+    func waitForKeyBackup() async
 }
 
 extension SecureBackupControllerMock {