Test/remove duplicate k8s versions

[vineetxkhurana]

This PR refactors Kubernetes version handling in integration tests by adding a helper function (GetKubernetesTestVersions) to helpers_test.go. The function ensures a unique, deduplicated list of Kubernetes versions for testing, so tests aren’t run multiple times for the same version. The aaa_download_only_test.go is updated to use this helper.

Why this change?
Previously, tests could run redundantly if DefaultKubernetesVersion and NewestKubernetesVersion were the same, leading to duplicate test runs.

What did I change?

Added GetKubernetesTestVersions() to test/integration/helpers_test.go.
Updated test/integration/aaa_download_only_test.go to use the new helper.
Reference:
Addresses issue #21483.

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