HSB-439 feature: invite link with SMTP optional (#4078)

* feat: env variable added in infra-config for smtp enable status

* feat: event emitter added

* feat: added advance mailer configurations from infra config

* test: fix test cases

* feat: added query to see is smtp enabled or not

* feat: email auth provider disabled on smtp disable

* chore: restrict on update directly instead of dedicated mutation

* fix: feedback resolved

* chore: modify mailer module

* chore: error handle in mailer functions

* chore: removed unused imports

* chore: remove event-emit

* chore: update env example

* test: fix broken test cases

* chore: feedback resolved

* chore: isSMTPEnabled moved to infra config resolver

* fix: email can not reenable if smtp not enabled

packages/hoppscotch-backend/src/gql-schema.ts

@@ -28,6 +28,7 @@ import { UserEnvsUserResolver } from './user-environment/user.resolver';
 import { UserHistoryUserResolver } from './user-history/user.resolver';
 import { UserSettingsUserResolver } from './user-settings/user.resolver';
 import { InfraResolver } from './admin/infra.resolver';
+import { InfraConfigResolver } from './infra-config/infra-config.resolver';
 
 /**
  * All the resolvers present in the application.
@@ -58,6 +59,7 @@ const RESOLVERS = [
   UserRequestUserCollectionResolver,
   UserSettingsResolver,
   UserSettingsUserResolver,
+  InfraConfigResolver,
 ];
 
 /**