Ws-182 Use mlccommons implementation as close as possible

[aivf-baisheng]

Description

Changed pre and post prompt as per requested and confirmed in the ticket.
Also created a new connection to make sure anything that has used the previous connection will not be affected

Motivation and Context

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Type of Change

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[aivf-kaydenyip]

LGTM, validated able to run cookbook with LlamaGuard2 Endpoint.