GH Actions CI s3 "make bucket" operation fix

[tzununbekov]

Multiple execution of the s3' mb operation causes an error, therefore, bucket creation is moved to one common "environment setup" step.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (cb4b57c) 37.80% compared to head (69f7f1a) 37.78%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5980      +/-   ##
==========================================
- Coverage   37.80%   37.78%   -0.03%     
==========================================
  Files         371      371              
  Lines       20665    20665              
==========================================
- Hits         7813     7808       -5     
  Misses      12073    12073              
- Partials      779      784       +5     

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