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82f3e32d - [Small upgrade] Allow document limit in AzureCognitiveSearchRetriever (#7690)

[Small upgrade] Allow document limit in AzureCognitiveSearchRetriever (#7690) Multiple people have asked in #5081 for a way to limit the documents returned from an AzureCognitiveSearchRetriever. This PR adds the `top_n` parameter to allow that. Twitter handle: [@UmerHAdil](twitter.com/umerHAdil)