Rename PrimaryOrBackup

[marcellorigotti]

Pull Request

Closes: PRO-1554

Checklist

Please conduct a thorough self-review before opening the PR.

• I am confident that the code works.
• I have written sufficient tests.
• I have written and tested required migrations.
• I have updated documentation where appropriate.

Summary

• Renamed Secondary to Backup
• Added PrimaryOrBackup to the logs when a request fails

Non-Breaking changes

[codecov]

Codecov Report

Attention: Patch coverage is 89.65517% with 6 lines in your changes missing coverage. Please review.

Project coverage is 71%. Comparing base (270839f) to head (0f3fb6d).

Files	Patch %	Lines
engine/src/retrier.rs	90%	3 Missing and 3 partials ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #5139   +/-   ##
=====================================
  Coverage     71%     71%           
=====================================
  Files        460     460           
  Lines      81655   81655           
  Branches   81655   81655           
=====================================
+ Hits       58111   58116    +5     
+ Misses     20445   20444    -1     
+ Partials    3099    3095    -4     

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