Prepare onboarding flow for personalisation screens.

Add a BuildSetting to control the display of the personalisation screens.
Add a property to delay the AuthenticationCoordinator from showing any screens.
Add Congratulations screen to onboarding flow.

RiotSwiftUI/Modules/Onboarding/Congratulations/Test/UI/OnboardingCongratulationsUITests.swift

@@ -0,0 +1,40 @@
+//
+// Copyright 2021 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import XCTest
+import RiotSwiftUI
+
+@available(iOS 14.0, *)
+class OnboardingCongratulationsUITests: MockScreenTest {
+
+    override class var screenType: MockScreenState.Type {
+        return MockOnboardingCongratulationsScreenState.self
+    }
+
+    override class func createTest() -> MockScreenTest {
+        return OnboardingCongratulationsUITests(selector: #selector(verifyOnboardingCongratulationsScreen))
+    }
+
+    func verifyOnboardingCongratulationsScreen() throws {
+        guard let screenState = screenState as? MockOnboardingCongratulationsScreenState else { fatalError("no screen") }
+        switch screenState {
+        case .congratulations:
+            // There isn't anything to test here
+            break
+        }
+    }
+
+}