Get rid of this.disposers while registering stuff in extensions (#1148)

Signed-off-by: Roman <ixrock@gmail.com>

extensions/telemetry/renderer.tsx

@@ -1,29 +1,23 @@
-import { LensRendererExtension, Registry } from "@k8slens/extensions";
+import { LensRendererExtension } from "@k8slens/extensions";
 import { telemetryPreferencesStore } from "./src/telemetry-preferences-store"
 import { TelemetryPreferenceHint, TelemetryPreferenceInput } from "./src/telemetry-preference"
 import { tracker } from "./src/tracker"
 import React from "react"
 
 export default class TelemetryRendererExtension extends LensRendererExtension {
+  appPreferences = [
+    {
+      title: "Telemetry & Usage Tracking",
+      components: {
+        Hint: () => <TelemetryPreferenceHint/>,
+        Input: () => <TelemetryPreferenceInput telemetry={telemetryPreferencesStore}/>
+      }
+    }
+  ];
+
   async onActivate() {
     console.log("telemetry extension activated")
     tracker.start()
     await telemetryPreferencesStore.loadExtension(this)
   }
-
-  registerAppPreferences(registry: Registry.AppPreferenceRegistry) {
-    this.disposers.push(
-      registry.add({
-        title: "Telemetry & Usage Tracking",
-        components: {
-          Hint: () => <TelemetryPreferenceHint />,
-          Input: () => <TelemetryPreferenceInput telemetry={telemetryPreferencesStore} />
-        }
-      })
-    )
-  }
-
-  onDeactivate() {
-    console.log("telemetry extension deactivated")
-  }
 }