check prefix and marker with returned key from S3

[davies]

No description provided.

[codecov-commenter]

Codecov Report

Merging #2040 (15a74ed) into main (3558e72) will decrease coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2040      +/-   ##
==========================================
- Coverage   61.60%   61.52%   -0.09%     
==========================================
  Files         137      137              
  Lines       23836    23854      +18     
==========================================
- Hits        14685    14675      -10     
- Misses       7436     7458      +22     
- Partials     1715     1721       +6     

Impacted Files	Coverage Δ
pkg/object/s3.go	42.65% <100.00%> (-0.63%)	⬇️
pkg/vfs/reader.go	77.18% <0.00%> (-3.11%)	⬇️
pkg/object/sharding.go	68.22% <0.00%> (-1.30%)	⬇️
pkg/vfs/writer.go	78.64% <0.00%> (-1.02%)	⬇️
pkg/object/swift.go	3.12% <0.00%> (-0.16%)	⬇️
pkg/meta/sql.go	64.89% <0.00%> (-0.10%)	⬇️
pkg/sync/sync.go	46.47% <0.00%> (-0.05%)	⬇️
pkg/object/bos.go	1.52% <0.00%> (-0.04%)	⬇️
pkg/chunk/cached_store.go	76.37% <0.00%> (+0.13%)	⬆️
... and 2 more

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