feat(holiday-system): implement comprehensive holiday management features

- Added holiday types and organization holidays management with CRUD operations.
- Introduced country holidays import functionality using the date-holidays npm package.
- Created database migrations for holiday types and organization holidays tables.
- Developed a holiday calendar component for visual representation and management of holidays.
- Enhanced API routes for holiday-related operations and integrated them into the admin center.
- Updated frontend localization for holiday management features.
- Implemented scripts for populating holidays in the database for 200+ countries.

worklenz-frontend/src/pages/admin-center/overview/overview.tsx

@@ -8,10 +8,10 @@ import { RootState } from '@/app/store';
 import { useTranslation } from 'react-i18next';
 import OrganizationName from '@/components/admin-center/overview/organization-name/organization-name';
 import OrganizationOwner from '@/components/admin-center/overview/organization-owner/organization-owner';
+import HolidayCalendar from '@/components/admin-center/overview/holiday-calendar/holiday-calendar';
 import { adminCenterApiService } from '@/api/admin-center/admin-center.api.service';
 import { IOrganization, IOrganizationAdmin } from '@/types/admin-center/admin-center.types';
 import logger from '@/utils/errorLogger';
-import { tr } from 'date-fns/locale';
 
 const { Text } = Typography;
 
@@ -82,6 +82,8 @@ const Overview: React.FC = () => {
             themeMode={themeMode}
           />
         </Card>
+
+        <HolidayCalendar themeMode={themeMode} />
       </Space>
     </div>
   );