Remove windowManager from extension api (#1323)

Signed-off-by: Jari Kolehmainen <jari.kolehmainen@gmail.com>

src/extensions/core-api/index.ts

@@ -2,8 +2,6 @@
 export * from "../lens-main-extension"
 export * from "../lens-renderer-extension"
 
-import type { WindowManager } from "../../main/window-manager";
-
 // APIs
 import * as App from "./app"
 import * as EventBus from "./event-bus"
@@ -12,9 +10,6 @@ import * as Util from "./utils"
 import * as ClusterFeature from "./cluster-feature"
 import * as Interface from "../interfaces"
 
-// TODO: allow to expose windowManager.navigate() as Navigation.navigate() in runtime
-export let windowManager: WindowManager;
-
 export {
   App,
   EventBus,