Altinity / clickhouse-backup / 25847929591

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fix(s3): also delete delete-markers and stop creating new ones on retry

getObjectAllVersions now returns both Versions and DeleteMarkers as
ObjectIdentifier list, so each delete-marker is removed by VersionId.

deleteKeys / deleteKey: when identifiers list is empty (key already
gone, e.g. on retry) skip instead of issuing a key-only DeleteObject —
which on a versioned bucket would create a fresh empty delete-marker.

Refs: avoid delete-marker accumulation on versioned S3 buckets when
batch delete is retried after a partial failure.

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