Refactor/simplify test asset directory look-up

[HeavyWombat]

Changes

Simplify the look-up for the test asset directory. No need for path cleaning function since it is a test case and the look-up is relative by default, so there is no need to look-up the current working directory.

Submitter Checklist

• [X] Includes tests if functionality changed/was added
• [ ] Includes docs if changes are user-facing
• [X] Set a kind label on this PR
• [X] Release notes block has been filled in, or marked NONE

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Release Notes

NONE

[openshift-ci[bot]]

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This pull-request has been approved by: SaschaSchwarze0

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