[Misc] Apply SonarCloud rule cpp:S1481 (!1148) · Merge requests · CTA / CTA · GitLab

Description

Rule name: Unused local variables should be removed
Rule code: cpp:S1481
Rule link: https://sonarcloud.io/project/issues?open=AZSYgH0QVBfLxbsoLJj1&id=cern-cta_CTA

Checklist

Documentation reflects the changes made.
Merge Request title is clear, concise, and suitable as a changelog entry. See our contributing docs

References

Closes #1410 (closed)