Configure the AuthenticationService later now that we have 2 flows on the start screen. (#3316)

* Don't query the homeserver until confirming it (or selecting a different one).

* Setup the infrastructure to test AuthenticationService.

Implement basic tests for configuration & password login.

* Use the real AuthenticationService with a mock Client in all of the tests.

* Add tests for the ServerConfirmationScreenViewModel.

* Remove redundant view state and test for it.

ElementX/Sources/UITests/UITestsAppCoordinator.swift

@@ -109,22 +109,16 @@ class MockScreen: Identifiable {
     
     lazy var coordinator: CoordinatorProtocol? = {
         switch id {
-        case .login:
-            let navigationStackCoordinator = NavigationStackCoordinator()
-            let coordinator = LoginScreenCoordinator(parameters: .init(authenticationService: MockAuthenticationService(),
-                                                                       analytics: ServiceLocator.shared.analytics,
-                                                                       userIndicatorController: ServiceLocator.shared.userIndicatorController))
-            navigationStackCoordinator.setRootCoordinator(coordinator)
-            return navigationStackCoordinator
         case .serverSelection:
             let navigationStackCoordinator = NavigationStackCoordinator()
-            let coordinator = ServerSelectionScreenCoordinator(parameters: .init(authenticationService: MockAuthenticationService(),
-                                                                                 userIndicatorController: ServiceLocator.shared.userIndicatorController,
-                                                                                 isModallyPresented: true))
+            let coordinator = ServerSelectionScreenCoordinator(parameters: .init(authenticationService: AuthenticationService.mock,
+                                                                                 authenticationFlow: .login,
+                                                                                 slidingSyncLearnMoreURL: ServiceLocator.shared.settings.slidingSyncLearnMoreURL,
+                                                                                 userIndicatorController: ServiceLocator.shared.userIndicatorController))
             navigationStackCoordinator.setRootCoordinator(coordinator)
             return navigationStackCoordinator
         case .authenticationFlow:
-            let flowCoordinator = AuthenticationFlowCoordinator(authenticationService: MockAuthenticationService(),
+            let flowCoordinator = AuthenticationFlowCoordinator(authenticationService: AuthenticationService.mock,
                                                                 qrCodeLoginService: QRCodeLoginServiceMock(),
                                                                 bugReportService: BugReportServiceMock(),
                                                                 navigationRootCoordinator: navigationRootCoordinator,

ElementX/Sources/UITests/UITestsScreenIdentifier.swift

@@ -20,7 +20,6 @@ enum UITestsScreenIdentifier: String {
     case createPoll
     case createRoom
     case createRoomNoUsers
-    case login
     case roomLayoutBottom
     case roomLayoutMiddle
     case roomLayoutTop