Add UI tests for AppLockFlowCoordinator. (#2055)

* Add UITests for the App Lock flow.

* Add Notification Signal

Fix unwanted imports in UITests.

ElementX/Sources/Application/AppCoordinatorProtocol.swift

@@ -18,5 +18,6 @@ import Foundation
 
 protocol AppCoordinatorProtocol: CoordinatorProtocol {
     var notificationManager: NotificationManagerProtocol { get }
+    var windowManager: WindowManager { get }
     @discardableResult func handleDeepLink(_ url: URL) -> Bool
 }