ci: remove stale CVE docs workflow

[major]

Summary

• Remove the legacy CVE/docs workflow that calls missing helper scripts.
• Keep project-update.yml as the active maintenance path for generated docs and CVE data.

Validation

• lsp_diagnostics on .github/workflows: 0 diagnostics.
• coderabbit review --agent --base origin/master -c .coderabbit.yaml: 0 findings.

[coderabbitai]

Important

Review skipped

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Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: cf7604bb-7bba-4804-a92c-4741b401a42d

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Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/remove-stale-cve-docs-workflow

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