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cacaf487 - Azure Cognitive Search - update sdk b8, mod user agent, search with scores (#9191)

Azure Cognitive Search - update sdk b8, mod user agent, search with scores (#9191) Description: Update Azure Cognitive Search SDK to version b8 (breaking change) Customizable User Agent. Implemented Similarity search with scores @baskaryan --------- Co-authored-by: Bagatur <baskaryan@gmail.com>