Fix Guardian test in CI Workflow

[fayvor]

• Fix path to Guardian/HAP

PR Checklist

• Commits signed: All commits must be GPG or SSH signed.
• DCO Compliance: Developer Certificate of Origin (DCO) applies to the code, documentation, and any example data provided. Ensure commits are signed off.
• Notebook outputs cleared: Ensure all notebook outputs are cleared.
• Automated testing: Add the recipe to the automated tests.
• Test in Google Colab:
  • Test that it works in Google Colab (Python 3.10.12).
  • Colab has its own package set and Python version, so ensure compatibility.
• Test locally:
  • Ensure the code works in a fresh Python virtual environment (venv).
• Flexible LLM platform support:
  • The platform should be easily switchable. Use LangChain for now.
  • Include !pip install git+https://github.com/ibm-granite-community/granite-kitchen in the instructions.
• Example data: Follow the example data guidance.
• README.md updates:
  • Add a link to the recipe in the Table of Contents (ToC).
  • Include a Colab button after that link.

[fayvor]

The Agentic RAG test is failing.
This can also sometimes fail due to summaries exceeding the context window in Summarize, which is fixed with this PR.