feat: automate account deletion (#11406)

- Automate the deletion of accounts that have requested deletion via
account settings.
- Add a Sidekiq job that runs daily to find accounts that have requested
deletion and have passed the 7-day window.
- This job deletes the account and then soft-deletes users if they do
not belong to any other account.
- This job also sends an email to the Chatwoot instance admin for
compliance purposes.
- The Chatwoot instance admin's email is configurable via the
`CHATWOOT_INSTANCE_ADMIN_EMAIL` global config.

---------

Co-authored-by: Sojan Jose <sojan@pepalo.com>

config/installation_config.yml

@@ -235,6 +235,14 @@
   description: Used to notify Chatwoot about account abuses, potential threads (Should be a Discord Webhook URL)
 # ------- End of Chatwoot Internal Config for Self Hosted ----#
 
+# ------- Compliance Related Config ----#
+- name: CHATWOOT_INSTANCE_ADMIN_EMAIL
+  display_title: 'Instance Admin Email'
+  value:
+  description: 'The email of the instance administrator to receive compliance-related notifications'
+  locked: false
+# ------- End of Compliance Related Config ----#
+
 ## ------ Configs added for enterprise clients ------ ##
 - name: API_CHANNEL_NAME
   value: