Add Harness CI example pipeline for react/react

[thisrohangupta]

Summary

Cloned react/react and generated an importable Harness v0 CI/CD pipeline based on its Yarn workspaces setup and upstream GitHub Actions (shared_lint.yml, runtime_build_and_test.yml).

Deliverables (examples/react-cicd/)

• react_ci_pipeline.yaml — Lint → Test (matrix) → Build (matrix) → Validate → Approve → Publish
• react_ci_trigger.yaml — GitHub push + PR webhook trigger stubs
• README.md — detection notes and import instructions

Detected stack

• Node v20.19.0, Yarn 1.22.22
• Commands: prettier-check, ESLint, license check, yarn test -r=…, yarn build --r=… --ci, flags / Fizz checks
• CD: optional npm prerelease publish behind approval (library has no container deploy target)

Not done in this PR

• Pipeline was not created in a live Harness account — Harness MCP needs authentication plus org_id / project_id. Provide those to import via UI or harness_create.

Test plan

• Paste react_ci_pipeline.yaml into Pipeline Studio YAML and resolve <+input> fields
• Confirm GitHub connector can clone react/react
• Run Lint stage on a sample branch
• Optionally enable Publish with NPM_TOKEN secret and approval user group

  

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[thisrohangupta]

Closing in impact triage: this is a stale example-only draft with no server/runtime change. It is not competitive with the production fixes and product features in the active queue.