Within ``, Multi-Factor Auth is Added via Dropdown

Within the <UserProfile /> component (which is also rendered by <UserButton />), adding a multi-factor auth (MFA) method is now rendered as a dropdown instead of a modal. If you were relying on the modal for any sort of customizations, these customizations will need to be adjusted to the new form factor.

Two new appearance prop keys were added to aid with this process: cl-menuList__mfa for styling the list of MFA factors, and cl-menuItem__mfa for styling individual items.