Merge multiple features in one XRAY result

[fundakol]

If there is multiple features files with the
same test plany ID and test execution ID
we should merge them in one XRAY results and publish only once #27.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.84%. Comparing base (cfb8034) to head (c726d19).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #29      +/-   ##
==========================================
+ Coverage   90.65%   90.84%   +0.18%     
==========================================
  Files           8        8              
  Lines         396      404       +8     
==========================================
+ Hits          359      367       +8     
  Misses         37       37              

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