Azure AI Search Retriever for Azure Gov Cloud - need to fix endpoint for resource connection

[ArjunChattoraj10]

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Feature request

In the Azure Government Cloud, the endpoint for Azure AI Search is different from that of Commercial Cloud. In Azure Gov Cloud, the endpoint has the following suffix: "openai.azure.us/" while for commercial cloud it is: "search.windows.net"

The request is to add the Gov Cloud suffix to the list of accepted suffixes for the AzureAISearchRetriever and to add documentation for the Gov Cloud URL.

Motivation

The lack of support for Gov Cloud makes developing in Gov Cloud/migrating from Commercial difficult because this breaks the retrieval.

Proposal (If applicable)

Add the Gov Cloud endpoint to the list of acceptable URL suffixes, or add it as a parameter to the class, or do away with autofilling the URL and force people to put the entire endpoint.