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

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

packages/hoppscotch-backend/package.json

@@ -48,7 +48,6 @@
     "graphql-subscriptions": "^2.0.0",
     "handlebars": "^4.7.7",
     "io-ts": "^2.2.16",
-    "ioredis": "^5.2.4",
     "luxon": "^3.2.1",
     "nodemailer": "^6.9.1",
     "passport": "^0.6.0",