feat: replace RAG with OKP, update vector_store embedding model

[maysunfaisal]

What does this PR do?:

• Remove byok_rag section (replaced by OKP)
• Remove stale TODO comment on annotation_prompt_params
• Update vector_store embedding model to nomic-ai/nomic-embed-text-v1.5
• Update vector_store path to /tmp/vector_db/notebooks/faiss_store.db
• Add rag.tool: [okp] and okp config block at bottom
• Stripping OKP from config in CI because we cannot realistically run OKP in local CI

Which issue(s) this PR fixes:

https://redhat.atlassian.net/browse/RHIDP-14130

PR acceptance criteria:

Testing and documentation do not need to be complete in order for this PR to be approved. We just need to ensure tracking issues are opened and linked to this PR, if they are not in the PR scope due to various constraints.

• Tested and Verified

• Documentation (READMEs, Product Docs, Blogs, Education Modules, etc.)

How to test changes / Special notes to the reviewer:

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[maysunfaisal]

Verified

[maysunfaisal]

generate gitops manifest script looks good after update:

mcp_servers:
  - name: mcp-integration-tools
    provider_id: "model-context-protocol"
    url: "http://localhost:7007/api/mcp-actions/v1"
    authorization_headers:
      Authorization: "client"
byok_rag:
  - rag_id: custom-org-docs
    rag_type: inline::faiss
    embedding_model: nomic-ai/nomic-embed-text-v1.5
    embedding_dimension: 768
    vector_db_id: vs_727b6321-1ff4-47bf-a76b-1cc12426c954
    db_path: /tmp/vector_db/custom_docs/faiss_store.db
    score_multiplier: 1.0
rag:
  tool:
    - custom-org-docs
    - okp
okp:
  rhokp_url: "${env.OKP_SERVICE_URL:=http://localhost:8080}"
  offline: true
  chunk_filter_query: "product:*developer_hub*"

[maysunfaisal]

@Jdubrick I think Rajin's BYOK Vector Store needs to be regenerated for OGX? 🤔

[Jdubrick]

We should change this to nomic too if we swapped it in the main config

[Jdubrick]

@Jdubrick I think Rajin's BYOK Vector Store needs to be regenerated for OGX? 🤔

Yeah most likely if it was created using llama stack instead of the ogx based generator. That can be a separate follow up issue IMO

[Jdubrick]

lgtm