RoomListViewModel: Add functionality to toggle message preview setting (#29511)

* Add setting for showing message previews

* Add hook to track and toggle message preview

* Use hook in view model

* Add tests

* Fix tests

* Fix lint

* Fix typo

test/unit-tests/components/views/rooms/RoomListPanel/RoomList-test.tsx

@@ -35,6 +35,8 @@ describe("<RoomList />", () => {
             activeSecondaryFilter: SecondaryFilters.AllActivity,
             sort: jest.fn(),
             activeSortOption: SortOption.Activity,
+            shouldShowMessagePreview: false,
+            toggleMessagePreview: jest.fn(),
         };
 
         // Needed to render a room list cell

test/unit-tests/components/views/rooms/RoomListPanel/RoomListPrimaryFilters-test.tsx

@@ -28,6 +28,8 @@ describe("<RoomListPrimaryFilters />", () => {
             activeSecondaryFilter: SecondaryFilters.AllActivity,
             sort: jest.fn(),
             activeSortOption: SortOption.Activity,
+            shouldShowMessagePreview: false,
+            toggleMessagePreview: jest.fn(),
         };
     });