[#393] Re-enable skipped conclusion

[beikov]

Fixed #393.

Testing done

Tested creating a check run with the SKIPPED conclusion which just works: https://github.com/beikov/hibernate-github-bot-test/runs/27508834193

Submitter checklist

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 71.66%. Comparing base (803edab) to head (762f466).
Report is 13 commits behind head on master.

Files	Patch %	Lines
...ins/plugins/checks/github/GitHubChecksDetails.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #394      +/-   ##
============================================
- Coverage     71.80%   71.66%   -0.14%     
  Complexity      162      162              
============================================
  Files            16       16              
  Lines           532      533       +1     
  Branches         51       51              
============================================
  Hits            382      382              
- Misses          124      125       +1     
  Partials         26       26              

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