Fix/kubernetes e2e test

[Pangjiping]

Summary

• skip NetworkPolicy test under kubernetes runtime
• adjust kubernetes workflow trigger for nightly build
• remove pause test under sandbox manager test
• fix flake test error under kubernetes test
• print exception stack when create workload failure

Testing

• Not run (explain why)
• Unit tests
• Integration tests
• e2e / manual verification

Breaking Changes

• None
• Yes (describe impact and migration path)

Checklist

• Linked Issue or clearly described motivation
• Added/updated docs (if needed)
• Added/updated tests (if needed)
• Security impact considered
• Backward compatibility considered

[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 5ba8562359

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[hittyt]

LGTM