fix(tests): add more time for getNotificationText.

The lobby tests were failing.

tests/pageobjects/Notifications.ts

     private async getNotificationText(testId: string) {
         const notificationElement = this.participant.driver.$(`[data-testid="${testId}"]`);
 
-        await notificationElement.waitForExist();
+        await notificationElement.waitForExist({ timeout: 2_000 });
 
         return await notificationElement.getText();
     }

tests/pageobjects/PreMeetingScreen.ts

      */
     isLobbyRoomJoined() {
         return this.participant.driver.execute(
-            () => APP.conference._room?.room?.getLobby()?.lobbyRoom?.joined === true);
+            () => APP?.conference?._room?.room?.getLobby()?.lobbyRoom?.joined === true);
     }
 
     /**