refactor: standardize TwoFactorRequiredModal using GenericModal

[NAME-ASHWANIYADAV]

TwoFactorRequiredModal currently uses raw fuselage primitives (Modal, ModalHeader, ModalTitle, ModalContent, ModalFooter, ModalFooterControllers, Button) to manually compose the modal layout.

The codebase provides a standardized GenericModal component (@rocket.chat/ui-client) that handles all of this via a simple prop-based API, and most modals have already been migrated to use it.

File: apps/meteor/client/views/root/MainLayout/TwoFactorRequiredModal.tsx

This modal should be refactored to use GenericModal for consistency with the rest of the codebase.

[NAME-ASHWANIYADAV]

hello guys !
I am working on this issue and will raise a pr for this shortly
THANK YOU !!