Make sampling clients also process freeing memory of deleted items. Currently only inserting clients do, so there always is some number of pending items waiting to release memory.
Make sampling clients also process freeing memory of deleted items. Currently only inserting clients do, so there always is some number of pending items waiting to release memory.

PiperOrigin-RevId: 383594600
Change-Id: Ia2613f323615df27162c056ac168c36cd6965cc3

deepmind/reverb,deepmind/reverb,deepmind/reverb,deepmind/reverb