HSB-445 feature: storing user last login timestamp (#4074)

* feat: lastLoggedOn added in schema and service function

* feat: add lastLoggedOn logic for magic link

* test: update test cases

* feat: add lastLoggedOn in gql model

* fix: nullable allowed in model attribute

* fix: resolve feedback

* feat: user last login interceptor added

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

@@ -41,6 +41,7 @@ const user: AuthUser = {
   photoURL: 'https://example.com/photo.png',
   isAdmin: false,
   refreshToken: null,
+  lastLoggedOn: new Date(),
   createdOn: new Date(),
   currentGQLSession: null,
   currentRESTSession: null,