ci: add kubescape security scanning workflow

[SpootyMcSpoot]

Summary

• Add Kubescape security compliance scanning via org reusable workflow
• Scans K8s manifests against NSA and MITRE frameworks on PRs
• Results uploaded to GitHub Security tab (SARIF)

Test plan

• Verify workflow triggers on PR with K8s changes
• Verify scan results appear in Security tab

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[SpootyMcSpoot]

Opened against wrong repo by mistake, closing.