Migrate from deprecated DefaultKubernetesClient to KubernetesClientBuilder

[dajudge]

Summary

Migrates all test code from the deprecated DefaultKubernetesClient constructor to the new KubernetesClientBuilder pattern recommended by fabric8 kubernetes-client.

Changes

Pattern Migration:

// Before (deprecated)
new DefaultKubernetesClient(config)

// After
new KubernetesClientBuilder().withConfig(config).build()

Additional Changes:

• Updated imports from DefaultKubernetesClient to KubernetesClient/KubernetesClientBuilder
• Changed method signatures to use KubernetesClient interface instead of concrete class
• Ensures future compatibility with fabric8 kubernetes-client updates

Testing

All existing tests should continue to pass without modification, as this is a drop-in replacement with identical behavior.

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