chore: use string verb to format logging messages in tests

[ovidiutirla]

What this PR does / why we need it:
The %w makes the CI to fail, replacing it back to %s.
After the #2358 was merged, looks like the CI is failing on the main branch.

How does this change affect the cardinality of KSM: (increases, decreases or does not change cardinality)
no impact

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

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[ovidiutirla]

This verb can be used only in 'fmt.Errorf' calls (%w) which makes the CI to fail on the main branch, see ci-go-lint, ci-benchmark-tests, ci-e2e-tests.

/assign @rexagod

[ovidiutirla]

The ci-benchmark-tests is failing as it's using the code from the main branch. Looks like for some reason on #2358 the CI didn't ran.

[mrueg]

/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mrueg, ovidiutirla

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[mrueg]

Merging this manually to get CI working :)

[rexagod]

That's my bad, I didn't notice the log.Fatalf call and assumed that to be a fmt.Errorf for some reason (%w is only valid there). 🤦