feat: include workspace in output of --print-effective-graph

[james-snyk]

Pull Request Submission Checklist

• Follows CONTRIBUTING guidelines
• Commit messages
  are release-note ready, emphasizing
  what was changed, not how.
• Includes detailed description of changes
• Contains risk assessment (Low | Medium | High)
• Highlights breaking API changes (if applicable)
• Links to automated tests covering new functionality
• Includes manual testing instructions (if necessary)
• Updates relevant GitBook documentation (PR link: ___)
• Includes product update to be announced in the next stable release notes

What does this PR do?

This PR adds workspace as an optional output property to the JSONL payloads of snyk test --print-effective-graph|--print-effective-graph-with-errors. This is so we can produce dep-graphs plus exhaustive plugin metadata in cli-extension-dep-graph, to then use it for test and monitor migration to the Unified Test API.

[snyk-io]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues
✅	Code Security	0	0	0	0	0 issues

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[mcombuechen]

not sure the if is needed, if it's undefined it will be dropped from the JSONL anyway.

[snyk-pr-review-bot]

PR Reviewer Guide 🔍

🧪 PR contains tests

🔒 No security concerns identified

⚡ No major issues detected

📚 Repository Context Analyzed This review considered 11 relevant code sections from 6 files (average relevance: 0.95) packages/snyk-fix/src/types.ts (lines 1-251) src/lib/snyk-test/run-test.ts (5 segments, lines 435-627) src/cli/main.ts (lines 1-235) package.json (lines 1-224) src/lib/plugins/get-multi-plugin-result.ts (2 segments, lines 1-230) src/lib/snyk-test/common.ts (lines 1-250)