[Kubernetes Test] Fix lint error on ktest.go

[constanca-m]

Proposed commit message

Please explain:

• WHAT: Fix the lint error on pre allocating the variables files.
• WHY: I forgot to address this comment on the related PR. This is the fix for that.

[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @constanca-m? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v8./d.0 is the label to automatically backport to the 8./d branch. /d is the digit

[MichaelKatsoulis]

Thanks!

[elasticmachine]

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• Start Time: 2023-12-05T10:43:11.917+0000

• Duration: 69 min 5 sec

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Test	Results
Failed	0
Passed	5031
Skipped	1051
Total	6082

💚 Flaky test report

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