🌱 kubetest: Remove usage of Viper, converting config files to kubetest arguments

[randomvariable]

What this PR does / why we need it:

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 #4729

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[randomvariable]

Need to test it.

[randomvariable]

tested locally with CAPA

[randomvariable]

/retest

[vincepri]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vincepri

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[randomvariable]

/retest

[vincepri]

/override pull-cluster-api-test-main

Tests are passing except for the known flake.

[k8s-ci-robot]

@vincepri: Overrode contexts on behalf of vincepri: pull-cluster-api-test-main

In response to this:

/override pull-cluster-api-test-main

Tests are passing except for the known flake.

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