[RHIDP-12414] Fix file-id leaking into query response

[Jdubrick]

What does this PR do?:

• Adds the annotation prompt template to override the default in Llama Stack. This template is what was causing the <| file -id xyz |> that was making its way into our responses.

Which issue(s) this PR fixes:

https://issues.redhat.com/browse/RHIDP-12414

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:

[JslYoon]

Just a question @Jdubrick would this address the reference error? My understanding was that this <| file -id xyz |> was coming from the vectordb configuration side

[Jdubrick]

Which reference error are you talking about @JslYoon? This PR fixes the reported issue here: https://redhat-internal.slack.com/archives/C081KVDV6LV/p1771989582617069?thread_ts=1771367096.585949&cid=C081KVDV6LV where its citing sources it used during the RAG tool calls, but incorrectly uses the internal file id because the default prompt template in Llama Stack is

annotation_instruction_template: Cite sources immediately at the end of sentences
      before punctuation, using `<|file-id|>` format like 'This is a fact <|file-Cn3MSNn72ENTiiq11Qda4A|>.'.
      Do not add extra punctuation. Use only the file IDs provided, do not invent
      new ones.

This updates that so these internal file ids don't get "cited" in the response