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* s3: ignore empty intermediate directories in bucketHasUserObjects (#11490) * s3: keep nested reserved-named dirs from hiding user objects Reserved folders (.uploads, *.versions) are internal only at the bucket root; deeper entries with those names are user key prefixes and must be walked. Also treat a missing subdirectory as empty via isFilerNotFound (list errors cross gRPC as status errors, not the sentinel), let names containing backslashes count as objects, and walk iteratively so empty chains deeper than the old scan depth no longer report non-empty. * s3: treat reserved-named directories as internal at every level Object listing interprets .uploads and *.versions directories as internal storage wherever they appear, so walking them during the emptiness check would report invisible version remnants as user objects and block deletion. A reserved name on a file still counts, matching listing which only special-cases directories. * s3: count explicit directory objects under reserved names A directory object created by PutObject (MIME or prefix-object marker set) is user data even when named .uploads or *.versions; only a plain directory with a reserved name is internal storage. --------- Co-authored-by: Chris Lu <chrislusf@users.noreply.github.com>