[stable-2.6] backport rag image and aap version

[ldjebran]

Jira Issue: https://issues.redhat.com/browse/AAP-57365

Description

The 2.6 branch is out dated in comparaison to latest 2.6 changes docs and rag content image number

This PR is to fix it by setting the right rag image in Makefile that contain the 2.6 docs but remain compatible with llama-stack 0.2.16

and cherry pick the changes made in this PR #102

That fix the version to 2.6

Testing

Steps to test

1. Pull down the PR
2. make clean
3. make setup
4. make build
5. make run
6. use the chatbot in a command line script or from the chatbot
7. query the chatbot about the latest version of AAP
   The version should 2.6
8. query the chatbot about: what is AAP?
   The response will contain links to 2.6 docs

---

Note

Updates RAG content image and switches system prompt and vector DB configs from AAP 2.5 to 2.6 across run/deploy files.

• Config and Data Sources:
  • Update RAG_CONTENT_IMAGE in Makefile to quay.io/ansible/aap-rag-content:1.0.1759978317.
  • Switch vector DB ID from "aap-product-docs-2_5" to "aap-product-docs-2_6" in ansible-chatbot-run.yaml and ansible-chatbot-mcp-run.yaml.
• System Prompt and Deploy:
  • Set core knowledge base "Current Version" to AAP 2.6 in ansible-chatbot-system-prompt.txt and ansible-chatbot-deploy.yaml.

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[TamiTakamiya]

LGTM. Thank you!!

[ldjebran]

/retest