Fix duo chat feedback tracking

What does this MR do and why?

Fix duo chat feedback tracking

The Duo chat component in gitlab-ui uses a different naming for the feedback data we receive. However, we didn't adapt this in our frontend.

See documentation: https://gitlab.com/gitlab-org/gitlab-ui/-/blob/main/src/components/experimental/duo/user_feedback/user_feedback.md#listening-to-the-feedback-form-submission

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