fix: refactor related to checklist observation (#73)

* refactor: removed unused files, dependencies and added valid callback URL

* chore: update env example

* test: fixed issue with subscription on deleteUserCollection in UserCollection module

* test: fixed time related issue with auth service methods

* chore: removed unused dependencies in auth.service file

---------

Co-authored-by: Mir Arif Hasan <arif.ishan05@gmail.com>
Co-authored-by: Balu Babu <balub997@gmail.com>

packages/hoppscotch-backend/src/user-collection/user-collection.service.spec.ts

@@ -873,7 +873,10 @@ describe('deleteUserCollection', () => {
     );
     expect(mockPubSub.publish).toHaveBeenCalledWith(
       `user_coll/${user.uid}/deleted`,
-      rootRESTUserCollection.id,
+      {
+        id: rootRESTUserCollection.id,
+        type: rootRESTUserCollection.type,
+      },
     );
   });
 });