More specifically, don't return a point version from the wrapped segment if that point is already marked for deletion within the proxy.

In some places we rely on point_version to tell us if (and what) point (version) exists in a segment. When a proxy segment marks a wrapped point for deletion, we should not expose its point version anymore.

The old behavior broke the following places (and potentially others):

• qdrant/lib/collection/src/collection_manager/holders/segment_holder.rs

  Line 395 in 5ffe70d

  let Some(point_version) = segment_lock.point_version(segment_point) else {

• qdrant/lib/collection/src/collection_manager/holders/segment_holder.rs

  Line 564 in 5ffe70d

  let version = write_segment.point_version(point_id).unwrap_or_default();

I'm currently still evaluating if stuff around this code is also sound.

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