rut: Use class variables for exception messages raised by Rut

[jtrobles-cdd]

No description provided.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.56%. Comparing base (c4efb69) to head (c76b044).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #871      +/-   ##
===========================================
+ Coverage    88.54%   88.56%   +0.01%     
===========================================
  Files           38       38              
  Lines         3484     3490       +6     
  Branches       340      340              
===========================================
+ Hits          3085     3091       +6     
  Misses         248      248              
  Partials       151      151              

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