Hi,
Welcome to the community!
At a guess, your client is familiar with SonarQube. Those issue statuses are built-in to the SonarQube issues interface. You need the Administer Issues permission to mark something Won’t Fix or False Positive. Once you do mark an issue one of those, it should stay that way as long as the issue context doesn’t change enough that it gets marked “new” again.
Confirm is also available, and sticky. It doesn’t require any permissions beyond ‘Browse’ on the project.
BTW, I don’t recommend wasting time marking anything “Resolve as fixed”. That status is available but it’s a holdover from the days when analysis-per-commit wasn’t common. If the issue isn’t actually fixed, that status gets rolled back at the next analysis. If it is fixed, the issue will be Closed (and cleaned out of the DB 30 days later). Either way, in a world where you analyze multiple times a day, “Resolve as Fixed” is really pointless.
HTH,
Ann