Improve the S3 operations

[emanuelez]

This PR allows to:

• fail builds if the S3 operation fails. Before the error code was swallowed by find
• remove the dependency on s3cmd

[codecov-io]

Codecov Report

Merging #2888 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2888      +/-   ##
==========================================
+ Coverage   92.61%   92.61%   +<.01%     
==========================================
  Files         245      245              
  Lines       75783    75782       -1     
  Branches     4345     4344       -1     
==========================================
+ Hits        70187    70189       +2     
  Misses       5250     5250              
+ Partials      346      343       -3

Impacted Files	Coverage Δ
test/test_thread.cpp	81.28% <0%> (-0.04%)	⬇️
test/main.cpp
test/benchmark-history-types/main.cpp	100% <0%> (ø)
test/test_shared.cpp	88.94% <0%> (+0.18%)	⬆️

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[emanuelez]

@alebsack ping :)

[finnschiermer]

@emanuelez @alebsack What's the future of this PR - it's been hanging around for a couple of weeks now?