[User Feedback] `release` set in feedback payload not showing up in Sentry

Reported on:
* https://github.com/getsentry/sentry-dotnet/issues/4135

This is a "feedback v2" payload.

[This can be confirmed by looking at feedbacks in Sentry](https://sentry.sentry.io/issues/feedback/?feedbackSlug=javascript%3A6573570322&project=11276&referrer=feedback_list_page&statsPeriod=7d)
