chore: Use test matrix for all supported versions

Hordur Freyr Yngvasonrequested to merge
add-test-matrix into master

In gitlab-org/cluster-integration/test-utils/k3s-gitlab-ci!10 (merged) we added images for older k3s versions under the same kubeconfig http interface, so we can test all our supported versions in one matrix.

Edited by Hordur Freyr Yngvason

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