feat(matrix): Matrix search UI (#27770)

...debar/header/MatrixFederationSearch/FederatedRoomList.tsx

...rixFederationSearch/FederatedRoomListEmptyPlaceholder.tsx

...MatrixFederationSearch/FederatedRoomListErrorBoundary.tsx

...r/header/MatrixFederationSearch/FederatedRoomListItem.tsx

...rixFederationSearch/MatrixFederationManageServerModal.tsx

...trixFederationSearch/MatrixFederationRemoveServerList.tsx

.../header/MatrixFederationSearch/MatrixFederationSearch.tsx

...ixFederationSearch/MatrixFederationSearchModalContent.tsx

...eor/client/sidebar/header/MatrixFederationSearch/index.ts

...derationSearch/useInfiniteFederationSearchPublicRooms.tsx

...ebar/header/MatrixFederationSearch/useMatrixServerList.ts

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

apps/meteor/packages/rocketchat-i18n/i18n/en.i18n.json

apps/meteor/tests/mocks/client/ServerProviderMock.tsx

...er/MatrixFederationSearch/MatrixFederationSearch.spec.tsx

...nit/client/sidebar/header/actions/Administration.spec.tsx