chore: `MenuV2` on `UserDropdown` (#29672)

apps/meteor/client/components/GenericMenu/GenericMenu.tsx

.../meteor/client/components/GenericMenu/GenericMenuItem.tsx

...ient/components/GenericMenu/hooks/useHandleMenuAction.tsx

...t/components/Omnichannel/OmnichannelSortingDisclaimer.tsx

apps/meteor/client/sidebar/header/UserAvatarButton.tsx

apps/meteor/client/sidebar/header/UserAvatarWithStatus.tsx

apps/meteor/client/sidebar/header/UserDropdown.tsx

apps/meteor/client/sidebar/header/UserMenu.tsx

apps/meteor/client/sidebar/header/UserMenuHeader.tsx

apps/meteor/client/sidebar/header/actions/Administration.tsx

apps/meteor/client/sidebar/header/actions/CreateRoom.tsx

apps/meteor/client/sidebar/header/actions/Sort.tsx

...t/sidebar/header/actions/hooks/useAdministrationItems.tsx

...teor/client/sidebar/header/actions/hooks/useAppsItems.tsx

...eor/client/sidebar/header/actions/hooks/useAuditItems.tsx

...lient/sidebar/header/actions/hooks/useCreateRoomItems.tsx

...ent/sidebar/header/actions/hooks/useGroupingListItems.tsx

...bar/header/actions/hooks/useMatrixFederationItems.tsx.tsx

.../client/sidebar/header/actions/hooks/useSortModeItems.tsx

.../client/sidebar/header/actions/hooks/useViewModeItems.tsx