chore: Ensure privilege validations for API endpoints (#2224)

Co-authored-by: Pranav Raj S <pranav@chatwoot.com>

spec/requests/api/v1/accounts/integrations/slack_request_spec.rb

@@ -2,7 +2,7 @@ require 'rails_helper'
 
 RSpec.describe 'Api::V1::Accounts::Integrations::Slacks', type: :request do
   let(:account) { create(:account) }
-  let(:agent) { create(:user, account: account, role: :agent) }
+  let(:agent) { create(:user, account: account, role: :administrator) }
   let!(:hook) { create(:integrations_hook, account: account) }
 
   describe 'POST /api/v1/accounts/{account.id}/integrations/slack' do