Fix emulator tests flakiness

Releasing the player once a sequence has ended seems to make our
emulator tests flaky. Comment out until we find the cause. The player
will still be released from TransformerInternal, when the export ends.

PiperOrigin-RevId: 520886181

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/SequenceAssetLoader.java

@@ -501,7 +501,9 @@ import java.util.concurrent.atomic.AtomicInteger;
     }
 
     private void release() {
-      handler.post(SequenceAssetLoader.this::release);
+      // TODO(b/276415739): releasing the player earlier causes more release timeouts on emulator
+      //  tests. Figure out what the cause is and uncomment the line below once fixed.
+      // handler.post(SequenceAssetLoader.this::release);
     }
   }
 }