[18.0-fr1] Add missing kubeconfig file name to shiftstack test

[openshift-cherrypick-robot]

This is an automated cherry-pick of #2743

/assign eurijon

[openshift-ci]

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[github-actions]

Thanks for the PR! ❤️
I'm marking it as a draft, once your happy with it merging and the PR is passing CI, click the "Ready for review" button below.

[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
you rerun jobs.

https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/691748bbaf80483eb7209e0062445ee6

✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 41m 18s
✔️ podified-multinode-edpm-deployment-crc SUCCESS in 1h 27m 26s
❌ cifmw-crc-podified-edpm-baremetal RETRY_LIMIT in 21m 38s
✔️ noop SUCCESS in 0s
✔️ cifmw-pod-ansible-test SUCCESS in 7m 53s
✔️ cifmw-pod-pre-commit SUCCESS in 7m 27s
✔️ build-push-container-cifmw-client SUCCESS in 22m 34s
✔️ cifmw-molecule-shiftstack SUCCESS in 15m 40s

[eurijon]

recheck

[pablintino]

@eurijon @rlobillo add your approval using GH approve button and this should be allowed to be merged.