Removes the task snapshot's reference earlier from the persist queue.

If the previous write request is duplicated from the latest request.

Flag: com.android.window.flags.release_snapshot_aggressively
Bug: 238206323
Test: use swipe-up gesture to close an app, which will has two take
task snapshot request. Verify only one screenshot reference in dmabuf
since previous request can be released as soon as possible.

Change-Id: Ia5b9764ff20423e854706dcfc081c339eb661dcc