[JENKINS-73380] Make sure that any existing reference build action is removed

[uhafner]

Otherwise, there will be multiple reference build actions, but there must be only one that identifies the baseline. Log an error message if the action already exists since the baseline should be constant.

See JENKINS-73380.

[github-actions]

☀️   Quality Monitor

   🚦   Tests: 100 % successful (✔️ 167 passed)
   〰️   Line Coverage: 73% (346 missed lines)
   ➰   Branch Coverage: 67% (122 missed branches)
     Mutation Coverage: 55% (344 survived mutations)
     CheckStyle: No warnings
     PMD: No warnings
     SpotBugs: No warnings

Created by Quality Monitor v1.9.0 (#00b9b1a). More details are shown in the GitHub Checks Result.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.63%. Comparing base (99e2c70) to head (444a93f).
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #558      +/-   ##
============================================
+ Coverage     72.56%   72.63%   +0.06%     
- Complexity      403      404       +1     
============================================
  Files            48       48              
  Lines          1232     1235       +3     
  Branches        108      109       +1     
============================================
+ Hits            894      897       +3     
  Misses          304      304              
  Partials         34       34              

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