test(integration): Enable test_room_preview and test_room_avatar_group_conversation.

These tests were failing since the migration from the sliding sync proxy
to Synapse.

Since the previous fixes to re-enable other tests, these 2 passes for
free.

Author: Hywan

testing/matrix-sdk-integration-testing/src/tests/sliding_sync/room.rs

@@ -122,7 +122,6 @@ async fn test_left_room() -> Result<()> {
 }
 
 #[tokio::test]
-#[ignore]
 async fn test_room_avatar_group_conversation() -> Result<()> {
     let alice = TestClientBuilder::new("alice").use_sqlite().build().await?;
     let bob = TestClientBuilder::new("bob").use_sqlite().build().await?;
@@ -970,7 +969,6 @@ async fn test_room_info_notable_update_deduplication() -> Result<()> {
 }
 
 #[tokio::test]
-#[ignore]
 async fn test_room_preview() -> Result<()> {
     let alice = TestClientBuilder::new("alice").use_sqlite().build().await?;
     let bob = TestClientBuilder::new("bob").use_sqlite().build().await?;