feat(k8s): add default commands for unknown platform

[afdesk]

Description

This PR introduces a default command handler for unknown Kubernetes platforms, such as Azure Kubernetes Service (AKS). When the platform type is unrecognized, the system will now return commands for Kubernetes (k8s type).

Related issues

• Close feat(k8s): using default node commands for unknown platform #7786

Related PRs

• feat: add default commands for unknown platform trivy-kubernetes#409

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Checklist

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• I've added tests that prove my fix is effective or that my feature works.
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