fix: disable unimplemented tests

[b-matteo]

Skip export tests for formats not yet implemented into CoreService

Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate unit tests.
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved to the PR if any.
• I have assigned this PR to myself.
• I have added the minimum version decorator to any new backend method implemented.
• I have made sure that the title of my PR follows Conventional commits style (e.g. feat: extrude circle to cylinder)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.37%. Comparing base (03a5774) to head (66b8691).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1691   +/-   ##
=======================================
  Coverage   91.37%   91.37%           
=======================================
  Files          87       87           
  Lines        7143     7143           
=======================================
  Hits         6527     6527           
  Misses        616      616           

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[MaxJPRey]

LGTM.

[RobPasMue]

Thanks @b-matteo