LCORE-3186: Added namespaces to test RAG db

[asimurka]

Description

Updates e2e BYOK FAISS fixtures (kv_store.db, pdf_kv_store.db) to use the OGX 1.0 vector_io::faiss: KV key namespace, and documents the requirement in tests/e2e/rag/README.md. Without this prefix, OGX 1.0 cannot see the committed stores and RAG e2e searches return empty results.

Type of change

• Refactor
• New feature
• Bug fix
• CVE fix
• Optimization
• Documentation Update
• Configuration Update
• Bump-up service version
• Bump-up dependent library
• Bump-up library or tool used for development (does not change the final image)
• CI configuration change
• Konflux configuration change
• Unit tests improvement
• Integration tests improvement
• End to end tests improvement
• Benchmarks improvement

Tools used to create PR

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• Assisted-by: Cursor

Related Tickets & Documents

• Related Issue # https://redhat.atlassian.net/browse/LCORE-3186
• Closes #

Checklist before requesting a review

• I have performed a self-review of my code.
• PR has passed all pre-merge test jobs.
• If it is a core feature, I have added thorough tests.

Testing

• Please provide detailed steps to perform tests related to this code change.
• How were the fix/results from this change verified? Please provide relevant screenshots or results.

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[asimurka]

Leftover - shields no longer access OGX

[tisnik]

LGTM