Remove obsolete capabilities, improve routine profile fetch

ts/background.ts

@@ -1850,12 +1850,6 @@ export async function startApp(): Promise<void> {
           // Note: we always have to register our capabilities all at once, so we do this
           //   after connect on every startup
           await server.registerCapabilities({
-            announcementGroup: true,
-            giftBadges: true,
-            'gv2-3': true,
-            senderKey: true,
-            changeNumber: true,
-            stories: true,
             pni: isPnpEnabled(),
           });
         } catch (error) {