test(timeline): get rid of custom handle_live_event

This is `TimelineInner::add_events_at` with fixed parameters.

crates/matrix-sdk-ui/src/timeline/inner/mod.rs

@@ -626,20 +626,6 @@ impl<P: RoomDataProvider> TimelineInner<P> {
         state.handle_ephemeral_events(events, &self.room_data_provider).await;
     }
 
-    #[cfg(test)]
-    pub(super) async fn handle_live_event(&self, event: SyncTimelineEvent) {
-        let mut state = self.state.write().await;
-        state
-            .add_remote_events_at(
-                vec![event],
-                TimelineEnd::Back,
-                RemoteEventOrigin::Sync,
-                &self.room_data_provider,
-                &self.settings,
-            )
-            .await;
-    }
-
     /// Creates the local echo for an event we're sending.
     #[instrument(skip_all)]
     pub(super) async fn handle_local_event(

crates/matrix-sdk-ui/src/timeline/tests/mod.rs

@@ -226,7 +226,7 @@ impl TestTimeline {
 
     async fn handle_live_event(&self, event: Raw<AnySyncTimelineEvent>) {
         let event = SyncTimelineEvent::new(event);
-        self.inner.handle_live_event(event).await
+        self.inner.add_events_at(vec![event], TimelineEnd::Back, RemoteEventOrigin::Sync).await;
     }
 
     async fn handle_local_event(&self, content: AnyMessageLikeEventContent) -> OwnedTransactionId {