Fix authentication activity indicators when the authentication server is being slow

* Fetch the OIDC login URL as part of the Server Confirmation screen.

The loading indicator would show and hide while configuring and then immediately show again while fetching the URL.

* Allow the OIDCAuthenticationPresenter to show its own errors.

We no longer need to present errors in the authentication flow coordinator.

ElementX/Sources/Screens/Authentication/SoftLogoutScreen/MockSoftLogoutScreenState.swift

@@ -29,11 +29,11 @@ enum MockSoftLogoutScreenState: String, CaseIterable {
         switch self {
         case .emptyPassword:
             return SoftLogoutScreenViewModel(credentials: credentials,
-                                             homeserver: .mockMatrixDotOrg,
+                                             homeserver: .mockBasicServer,
                                              keyBackupNeeded: false)
         case .enteredPassword:
             return SoftLogoutScreenViewModel(credentials: credentials,
-                                             homeserver: .mockMatrixDotOrg,
+                                             homeserver: .mockBasicServer,
                                              keyBackupNeeded: false,
                                              password: "12345678")
         case .oidc:
@@ -46,7 +46,7 @@ enum MockSoftLogoutScreenState: String, CaseIterable {
                                              keyBackupNeeded: false)
         case .keyBackupNeeded:
             return SoftLogoutScreenViewModel(credentials: credentials,
-                                             homeserver: .mockMatrixDotOrg,
+                                             homeserver: .mockBasicServer,
                                              keyBackupNeeded: true)
         }
     }

ElementX/Sources/Screens/Authentication/SoftLogoutScreen/SoftLogoutScreenCoordinator.swift

@@ -143,7 +143,8 @@ final class SoftLogoutScreenCoordinator: CoordinatorProtocol {
                 
                 let presenter = OIDCAuthenticationPresenter(authenticationService: parameters.authenticationService,
                                                             oidcRedirectURL: ServiceLocator.shared.settings.oidcRedirectURL,
-                                                            presentationAnchor: presentationAnchor)
+                                                            presentationAnchor: presentationAnchor,
+                                                            userIndicatorController: parameters.userIndicatorController)
                 self.oidcPresenter = presenter
                 switch await presenter.authenticate(using: oidcData) {
                 case .success(let userSession):