Verify Etag from OBS

[davies]

We have experienced data loss from OBS silently, so we should double check the returned ETag from OBS.

[codecov-commenter]

Codecov Report

Merging #1715 (776c550) into main (f55ba44) will decrease coverage by 0.15%.
The diff coverage is 0.00%.

❗ Current head 776c550 differs from pull request most recent head 3562b2f. Consider uploading reports for the commit 3562b2f to get more accurate results

@@            Coverage Diff             @@
##             main    #1715      +/-   ##
==========================================
- Coverage   61.70%   61.55%   -0.16%     
==========================================
  Files         134      135       +1     
  Lines       22721    22883     +162     
==========================================
+ Hits        14020    14085      +65     
- Misses       7126     7198      +72     
- Partials     1575     1600      +25     

Impacted Files	Coverage Δ
pkg/object/obs.go	0.95% <0.00%> (-0.04%)	⬇️
pkg/fuse/context.go	56.75% <0.00%> (-10.82%)	⬇️
pkg/vfs/reader.go	77.18% <0.00%> (-7.49%)	⬇️
pkg/chunk/cached_store.go	77.36% <0.00%> (-1.15%)	⬇️
pkg/meta/base.go	71.18% <0.00%> (-0.51%)	⬇️
pkg/meta/utils.go	71.18% <0.00%> (-0.49%)	⬇️
pkg/meta/sql.go	66.92% <0.00%> (-0.21%)	⬇️
pkg/meta/tkv_etcd.go	77.77% <0.00%> (ø)
pkg/meta/tkv.go	76.55% <0.00%> (+0.02%)	⬆️
pkg/meta/tkv_prefix.go	96.61% <0.00%> (+0.18%)	⬆️
... and 1 more

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