[User Feedback] It's not clear enough to users that their name/email may still be submitted when name/email fields are hidden

It's a little creepy to reply to users who have submitted feedback when the feedback form is not explicit about whether the feedback is being submitted anonymously or not. For example, it's ambiguous when `Sentry.setUser()` has been called, but the feedback integration has `showEmail: false` set.

**Suggestion:**
Make it explicit on the form that things are not sent anonymously