[JENKINS-74008] Extract JavaScript block from FixedWarningsDetail/index.jelly

[yaroslavafenkin]

https://issues.jenkins.io/browse/JENKINS-74008

Testing done

I'm not able to find a way to make fixed issues appear. I've had a bunch of PMD issues in the project I had been testing this against, but fixing them only makes the list of violations shorter. If someone points me to how I can make fixed issues appear I'd be happy to test that scenario and record my screen.

Before the change

After the change

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

All modified and coverable lines are covered by tests ✅

Project coverage is 82.52%. Comparing base (da7e0e8) to head (b966308).
Report is 24 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1869      +/-   ##
============================================
- Coverage     82.62%   82.52%   -0.10%     
+ Complexity     1365     1363       -2     
============================================
  Files           249      249              
  Lines          5243     5243              
  Branches        402      402              
============================================
- Hits           4332     4327       -5     
- Misses          801      805       +4     
- Partials        110      111       +1     

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