Change avatar to use Compound implementation (#11448)

* Move avatar to new compound implementation

* Make space avatars square

* Remove reference to the avatar initial CSS class

* remove references to mx_BaseAvatar_image

* Fixe test suites

* Fix accessbility violations

* Add ConfirmUserActionDialog test

* Fix tests

* Add FacePile test

* Fix items clipping in members list

* Fix user info avatar sizing

* Fix tests

res/css/views/rooms/_RoomPreviewCard.pcss

@@ -70,13 +70,6 @@ limitations under the License.
         display: flex;
         align-items: center;
 
-        .mx_RoomAvatar_isSpaceRoom {
-            &.mx_BaseAvatar_image,
-            .mx_BaseAvatar_image {
-                border-radius: 12px;
-            }
-        }
-
         .mx_RoomPreviewCard_video {
             width: 50px;
             height: 50px;