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 points the RAG vector DB to aap-product-docs-2_6.

• RAG/Config:
  • Update vector_db_id from aap-product-docs-2_5 to aap-product-docs-2_6 in ansible-chatbot-run.yaml.
• System Prompt / Deployment:
  • Change CORE_KNOWLEDGE_BASE "Current Version" from AAP 2.5 to AAP 2.6 in ansible-chatbot-system-prompt.txt and ansible-chatbot-deploy.yaml.

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