Update chatbot vector DB to v2 6

[TamiTakamiya]

Jira Issue: https://issues.redhat.com/browse/AAP-51967

Description

Update vector DB from V2.5 to V2.6

Testing

Steps to test

1. Pull down the PR
2. Run unit tests

Scenarios tested

Unit and manual tests.

Production deployment

• This code change is ready for production on its own
• This code change requires the following considerations before going to production: Corresponding ansible-wisdom-ops files need to be updated

---

Note

Updates AAP version references from 2.5 to 2.6 and switches the vector DB from aap-product-docs-2_5 to aap-product-docs-2_6.

• Runtime configuration:
  • Switch vector DB ID from aap-product-docs-2_5 to aap-product-docs-2_6 in ansible-chatbot-mcp-run.yaml and ansible-chatbot-run.yaml.
• System prompt:
  • Update CORE_KNOWLEDGE_BASE current version from AAP 2.5 to AAP 2.6 in ansible-chatbot-deploy.yaml and ansible-chatbot-system-prompt.txt.

^{Written by Cursor Bugbot for commit 1fc33c0. This will update automatically on new commits. Configure here.}