imp: remove redundant path constructions in ibc-testkit

[Farhad-Shabani]

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PR author checklist:

• Added changelog entry, using unclog.
• Tagged one reviewer who will be the one responsible for shepherding this PR.

Reviewer checklist:

• Reviewed Files changed in the GitHub PR explorer.
• Manually tested (in case integration/unit/mock tests are absent).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.43%. Comparing base (25f730d) to head (a3ab563).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1338      +/-   ##
==========================================
- Coverage   66.46%   66.43%   -0.04%     
==========================================
  Files         227      227              
  Lines       23098    23076      -22     
==========================================
- Hits        15352    15330      -22     
  Misses       7746     7746              

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