fix: Fix for cwyd combination gp bug #40268

[NirajC-Microsoft]

Purpose

This pull request strengthens the enforcement of always using document search or question answering tools before responding to user queries in various orchestrator modules. The changes clarify that the system must not answer questions directly or decide a query is out of domain without first searching the relevant documents. This helps ensure that all responses are grounded in the available data sources.

Prompt and System Message Enforcement:

• Updated the lang_chain_agent.py prompt to require that the Question Answering tool is always used first before answering any user question, and to never answer directly without using this tool.
• Updated the open_ai_functions.py system message to require always calling the search_documents function first for any user question and never deciding a question is out of domain without searching.
• Clarified that the response "The requested information is not available in the retrieved data..." should only be given after calling search_documents and finding no relevant information, rather than preemptively.
• Updated the semantic_kernel.py system message to require always calling the search_documents function first for any user question, and never deciding a question is out of domain without searching.

Does this introduce a breaking change?

• Yes
• No

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install

• Test the code

What to Check

Verify that the following are valid

• ...

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