S3: get_object_attributes() now also works for Glacier objects

[bblommers]

Fixes #8307

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.56%. Comparing base (c9536b1) to head (66eaeb3).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8315   +/-   ##
=======================================
  Coverage   94.56%   94.56%           
=======================================
  Files        1159     1159           
  Lines      100881   100881           
=======================================
  Hits        95403    95403           
  Misses       5478     5478           

Flag	Coverage Δ
servertests	28.87% <66.66%> (ø)
unittests	94.54% <100.00%> (ø)

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