Remove GenericCallLinkCoordinator, merging it into CallScreen. (#3181)

* Remove incorrect message send call and fix typo.

* Add overlay coordinator presentation to the NavigationRootCoordinator.

* Remove GenericCallLinkCoordinator, merging it into CallScreen.

This will allow for picture in picture on call links when available.

ElementX/Sources/Services/ElementCall/GenericCallLinkWidgetDriver.swift

@@ -0,0 +1,44 @@
+//
+// Copyright 2024 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 Combine
+import SwiftUI
+
+class GenericCallLinkWidgetDriver: ElementCallWidgetDriverProtocol {
+    private let url: URL
+    
+    let widgetID = UUID().uuidString
+    let messagePublisher = PassthroughSubject<String, Never>()
+    
+    private let actionsSubject: PassthroughSubject<ElementCallWidgetDriverAction, Never> = .init()
+    var actions: AnyPublisher<ElementCallWidgetDriverAction, Never> {
+        actionsSubject.eraseToAnyPublisher()
+    }
+    
+    init(url: URL) {
+        self.url = url
+    }
+    
+    func start(baseURL: URL, clientID: String, colorScheme: ColorScheme) async -> Result<URL, ElementCallWidgetDriverError> {
+        MXLog.error("Nothing to start, use the configuration's URL directly instead.")
+        return .success(url)
+    }
+    
+    func handleMessage(_ message: String) async -> Result<Bool, ElementCallWidgetDriverError> {
+        // The web view doesn't send us messages through the Widget API, so nothing to implement (yet?).
+        .failure(.driverNotSetup)
+    }
+}