fix: show the success toast for adding fma (#24500)

> Related issue: #24482

# Checklist for submitter

If some of the following don't apply, delete the relevant line.

<!-- Note that API documentation changes are now addressed by the
product design team. -->

- [x] Manual QA for all new/changed functionality

frontend/pages/SoftwarePage/SoftwareAddPage/SoftwareFleetMaintained/FleetMaintainedAppDetailsPage/FleetMaintainedAppDetailsPage.tsx

@@ -189,7 +189,8 @@ const FleetMaintainedAppDetailsPage = ({
           "success",
           <>
             <b>{fleetApp?.name}</b> successfully added.
-          </>
+          </>,
+          { persistOnPageChange: true }
         );
       } catch (e) {
         renderFlash(