Cleanup Duo Chat Claude 3.7 feature flags

Shinya Maedarequested to merge
cleanup-duo-chat-claude3-7-ff into master

What does this MR do and why?

This MR cleans up Duo Chat Claude 3.7 feature flags.

Related to #521283 (closed) #521833 (closed) and #523200 (closed)

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Edited by Shinya Maeda

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