imp: remove redundant path constructions in ibc-testkit

[Farhad-Shabani]

---

PR author checklist:

• [x] Added changelog entry, using unclog.
• [X] 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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.