Cherry-pick #29311, #29343, #29358, #27913, and #29447 onto stable/1.85.x - #29458

Cherry-pick #29311, #29343, #29358, #27913, and #29447 onto stable/1.85.x#29458

yuneng-berri wants to merge 5 commits into

stable/1.85.xBerriAI/litellm:stable/1.85.xfrom

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