feat: Audit Logs for Account User Changes (#7405)

- Audit log for user invitations: https://linear.app/chatwoot/issue/CW-1768/invited-a-user-to-the-account
- Audit log for change role: https://linear.app/chatwoot/issue/CW-1767/name-or-email-changed-the-role-of-the-user-email-to-agent-or-admin
- Audit log for status change: https://linear.app/chatwoot/issue/CW-1766/availability-status-as-events-for-audit-logs


Co-authored-by: Shivam Mishra <scm.mymail@gmail.com>

spec/models/account_user_spec.rb

@@ -2,7 +2,7 @@
 
 require 'rails_helper'
 
-RSpec.describe User do
+RSpec.describe AccountUser do
   include ActiveJob::TestHelper
 
   let!(:account_user) { create(:account_user) }