[JENKINS-72015] Make reference build computation more flexible

[uhafner]

Add new property requiredResult for reference jobs.

When a reference build is searched for in the baseline (see the parameter reference job) then it
sometimes makes sense to only consider builds that have a certain result. For example, you may want to skip the computation of a delta coverage when the reference build has failed tests. Or you may want to skip the computation of new warnings when the reference build has a compilation error.

See also:

• https://issues.jenkins.io/browse/JENKINS-72015
• https://issues.jenkins.io/browse/JENKINS-66890

[codecov]

Codecov Report

Attention: Patch coverage is 76.40449% with 21 lines in your changes are missing coverage. Please review.

Project coverage is 72.35%. Comparing base (5826a40) to head (4c3ec58).
Report is 12 commits behind head on main.

❗ Current head 4c3ec58 differs from pull request most recent head 5aeffde. Consider uploading reports for the commit 5aeffde to get more accurate results

Files	Patch %	Lines
...plugins/forensics/reference/ReferenceRecorder.java	56.52%	8 Missing and 2 partials ⚠️
...s/forensics/reference/SimpleReferenceRecorder.java	88.23%	3 Missing and 3 partials ⚠️
...ns/plugins/forensics/reference/ReferenceBuild.java	61.53%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #519      +/-   ##
============================================
+ Coverage     71.58%   72.35%   +0.76%     
- Complexity      386      398      +12     
============================================
  Files            48       48              
  Lines          1172     1219      +47     
  Branches        102      108       +6     
============================================
+ Hits            839      882      +43     
- Misses          298      302       +4     
  Partials         35       35              

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