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>

app/services/account_deletion_service.rb

@@ -0,0 +1,50 @@
+class AccountDeletionService
+  attr_reader :account, :soft_deleted_users
+
+  def initialize(account:)
+    @account = account
+    @soft_deleted_users = []
+  end
+
+  def perform
+    Rails.logger.info("Deleting account #{account.id} - #{account.name} that was marked for deletion")
+
+    soft_delete_orphaned_users
+    send_compliance_notification
+    DeleteObjectJob.perform_later(account)
+  end
+
+  private
+
+  def send_compliance_notification
+    AdministratorNotifications::AccountComplianceMailer.with(
+      account: account,
+      soft_deleted_users: soft_deleted_users
+    ).account_deleted(account).deliver_later
+  end
+
+  def soft_delete_orphaned_users
+    account.users.each do |user|
+      # Find all account_users for this user excluding the current account
+      other_accounts = user.account_users.where.not(account_id: account.id).count
+
+      # If user has no other accounts, soft delete them
+      next unless other_accounts.zero?
+
+      # Soft delete user by appending -deleted.com to email
+      original_email = user.email
+      user.email = "#{original_email}-deleted.com"
+      user.skip_reconfirmation!
+      user.save!
+
+      user_info = {
+        id: user.id.to_s,
+        original_email: original_email
+      }
+
+      soft_deleted_users << user_info
+
+      Rails.logger.info("Soft deleted user #{user.id} with email #{original_email}")
+    end
+  end
+end