Add message preview support to the new room list (#29784)

* Add message preview support to the new room list

 * Support showing message previews in the room list items
 * Add the secondary filters bar with the '...' menu, containing
   just the option for message previews for now
 * Change message preview toggle hook to update when setting is updated

* Use new compund release

* Unused i18n keys

* Unused imports

* Fix test & update snapshot

* Fix more snapshots

* Fix test

Split into two tests that test setting & updating

* Type import

* Snapshots

* Remove unnecessary Flex container

and update screenshots as the room list has got shorter from the added bar

* More snapshots & screenshots

* More snapshots

* Add test and remove active filter that's not done yet

* Update snapshots & screenshots again

* Other screenshot

* Add more tests

* Fix syntax

* Fix tests

* Use setter directly

Co-authored-by: Michael Telatynski <7t3chguy@gmail.com>

* Fix CSS

* Remopve filter button css for now

* Update to remove forwardRef

* Add comment on why lack of TypedEventEmitter

* snapshots again

* Screenshots again

* Use original screenshots, maybe they'll work now

* Add comment

---------

Co-authored-by: Michael Telatynski <7t3chguy@gmail.com>

res/css/views/rooms/RoomListPanel/_RoomListItemView.pcss

@@ -35,11 +35,23 @@
             box-sizing: border-box;
             min-width: 0;
 
+            .mx_RoomListItemView_text {
+                max-width: 100%;
+            }
+
             .mx_RoomListItemView_roomName {
                 white-space: nowrap;
                 overflow: hidden;
                 text-overflow: ellipsis;
             }
+
+            .mx_RoomListItemView_messagePreview {
+                font: var(--cpd-font-body-sm-regular);
+                color: var(--cpd-color-text-secondary);
+                white-space: nowrap;
+                overflow: hidden;
+                text-overflow: ellipsis;
+            }
         }
     }
 }