GITOPS-10535: add unit tests for core string and URL utilities

[trdoyle81]

Port of #264 to release-4.18

Relates to:
https://redhat.atlassian.net/browse/GITOPS-10535
#264

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Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (release-4.18@0dca06a). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff               @@
##             release-4.18     #268   +/-   ##
===============================================
  Coverage                ?   11.34%           
===============================================
  Files                   ?      169           
  Lines                   ?     6679           
  Branches                ?     2292           
===============================================
  Hits                    ?      758           
  Misses                  ?     5915           
  Partials                ?        6           

Flag	Coverage Δ
unit-tests	11.34% <100.00%> (?)

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