[CI] Upload artifact should work if only back or front has worked (#9687)

[aHenryJard]

Proposed changes

• check if folder to archive to JFrog exist before tar.gz, to be allowed to get either frontend/backend tests artefact even if the other steps fails.

Related issues

• closes [CI/Drone] Make upload artefact step more resilient #9687

• Example of fail api test build with artifact uploaded for frontend e2e tests

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case (coverage and e2e)
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.26%. Comparing base (25b9dfb) to head (c284a06).
Report is 13 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9681      +/-   ##
==========================================
+ Coverage   65.25%   65.26%   +0.01%     
==========================================
  Files         630      630              
  Lines       60244    60244              
  Branches     6756     6763       +7     
==========================================
+ Hits        39312    39319       +7     
+ Misses      20932    20925       -7     

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