chore: Add assigned option to conversation finder API (#2630)

- Adds the ability to filter all the conversations which are assigned
- Add rack timeout gem
- Remove size attribute from Sidekiq config

config/schedule.yml

@@ -11,4 +11,5 @@ internal_check_new_versions_job:
 internal_check_new_versions_job:
   cron: "*/5 * * * *"
   class: "TriggerScheduledItemsJob"
-  queue: scheduled_jobs
+  queue: scheduled_jobs
+