Wire up MSC2931 widget navigation

Fixes https://github.com/vector-im/element-web/issues/16006
**Requires https://github.com/matrix-org/matrix-widget-api/pull/27**

src/stores/widgets/ElementWidgetActions.ts

@@ -20,9 +20,16 @@ export enum ElementWidgetActions {
     ClientReady = "im.vector.ready",
     HangupCall = "im.vector.hangup",
     OpenIntegrationManager = "integration_manager_open",
+
+    /**
+     * @deprecated Use MSC2931 instead
+     */
     ViewRoom = "io.element.view_room",
 }
 
+/**
+ * @deprecated Use MSC2931 instead
+ */
 export interface IViewRoomApiRequest extends IWidgetApiRequest {
     data: {
         room_id: string; // eslint-disable-line camelcase