UI test fixes (#335)

* Remove status bars when running UITests
* Remove simulator OS versions from screenshot names, be less lenient with image diffing
* Rename UITests splash screen to onboarding
* Switch tests to Xcode 14.1, remove version names for used simulators and switched from iPhone 13 Pro Max to iPhone 14
* Fix ServiceLocator and fallbackLaguage for UI tests
* Drop snapshot diffing precision to 0.99 as 0.999 triggers false negatives
* Fix server selection UI tests after exposing the sliding sync proxy configuration
* Update reference screenshots

ElementX/Sources/UITests/UITestScreenIdentifier.swift

@@ -29,7 +29,7 @@ enum UITestScreenIdentifier: String {
     case settings
     case bugReport
     case bugReportWithScreenshot
-    case splash
+    case onboarding
     case roomPlainNoAvatar
     case roomEncryptedWithAvatar
     case sessionVerification

ElementX/Sources/UITests/UITestsAppCoordinator.swift

@@ -18,11 +18,14 @@ import SwiftUI
 import UIKit
 
 class UITestsAppCoordinator: AppCoordinatorProtocol {
+    private var currentRootCoordinator: CoordinatorProtocol?
     private let navigationController: NavigationController
     let notificationManager: NotificationManagerProtocol? = nil
     
     init() {
         navigationController = NavigationController()
+        
+        ServiceLocator.shared.register(userNotificationController: MockUserNotificationController())
     }
     
     func start() {
@@ -31,11 +34,17 @@ class UITestsAppCoordinator: AppCoordinatorProtocol {
             guard let screen = screens.first(where: { $0.id == id }) else {
                 fatalError()
             }
-
+            
+            // Store the initial coordinator so that it stays alive if drops it
+            // For example when replacing the root in the authentication flows
+            self.currentRootCoordinator = screen.coordinator
+            
             self.navigationController.setRootCoordinator(screen.coordinator)
         }
         
         navigationController.setRootCoordinator(rootCoordinator)
+        
+        Bundle.elementFallbackLanguage = "en"
     }
         
     func toPresentable() -> AnyView {
@@ -105,7 +114,7 @@ class MockScreen: Identifiable {
                                                           userNotificationController: MockUserNotificationController(),
                                                           screenshot: Asset.Images.appLogo.image,
                                                           isModallyPresented: false))
-        case .splash:
+        case .onboarding:
             return OnboardingCoordinator()
         case .roomPlainNoAvatar:
             let parameters = RoomScreenCoordinatorParameters(navigationController: navigationController,