Defer close snapshot's hardware buffer after remove snapshot from cache

The hardware buffer can be closed when either:
1. No transition is collecting/running, or
2. After a transition finish.

This provides a simple protection because we have ensure the snapshot
object is removed from cache, so either it's not used anymore, or it's
used for a collecting transition. The queued transition won't able
to get the snapshot because it was removed from cache.

Flag: com.android.window.flags.safe_release_snapshot_aggressively
Bug: 238206323
Bug: 402277988
Test: atest TaskSnapshotCacheTest TaskSnapshotLowResDisabledTest
TaskSnapshotPersisterLoaderTest ActivitySnapshotControllerTests

Change-Id: I549d9abdb2ca0d18a22cbc74cbf13fcdf3f4bb0a