[JENKINS-74008] Remove SourceDetail/*

[yaroslavafenkin]

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

I've searched for the class name in the jenkinsci org and the single reference that exists is in analysis-core-plugin, the distribution of which has been suspended.
My guess is that SourceDetail got replaced by SourceCodeViewModel from Prism API. SourceCodeViewModel/index.jelly had code that was very similar to what I'm removing here. Prism API got its fix in jenkinsci/prism-api-plugin#181.

Testing done

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 82.56%. Comparing base (06e31fd) to head (b97fd7f).
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1884      +/-   ##
============================================
- Coverage     82.66%   82.56%   -0.10%     
+ Complexity     1366     1364       -2     
============================================
  Files           249      249              
  Lines          5243     5243              
  Branches        402      402              
============================================
- Hits           4334     4329       -5     
- Misses          799      803       +4     
- Partials        110      111       +1     

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[uhafner]

Yes you are right. I forgot to remove this code after the migration to the prism plugin!

[basil]

Could this please be released? I don't think the removal will cause any problems, but in the (unlikely) chance that it does, it would be good to find out sooner rather than later.