Add CI workflow to run tests on pull requests

[RobuRishabh]

Summary

• Add ci.yml workflow triggered on every PR (opened, synchronize, reopened)
• Runs unit tests with coverage (pytest tests/unit/ --cov)
• Validates notebook parameters (pytest tests/integration/test_notebook_parameters.py)
• Uploads coverage to Codecov

Context

Part of AI Bug Automation Readiness assessment — Task 13: CI Runs Tests on PRs.

Test plan

• Workflow YAML is valid (check with act or GitHub Actions syntax checker)
• CI triggers on PR creation

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Central YAML (base), Organization UI (inherited)

Review profile: CHILL

Plan: Pro

Run ID: 5325a418-65e6-4491-af95-410797ce1307

📥 Commits

Reviewing files that changed from the base of the PR and between 36f93ff and eb97b20.

📒 Files selected for processing (2)

• .github/workflows/ci.yml
• docs/ci-runs-tests-on-prs.md

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[RobuRishabh]

Closing: will resubmit with corrected scope (kubeflow-pipelines/ only, no duplicate workflows).