RHINENG-21470: filter stale systems in sys-adv view

This adds a where condition that will filter out stale systems from the
systems advisories view calls. This is done to ensure unified behavior
(chosen systems) while planning remediation on the advisories FE page.

Author: dominikvagner

manager/controllers/systems_advisories_view.go

@@ -158,7 +158,9 @@ func advisoriesSystemsQuery(c *gin.Context, db *gorm.DB, acc int, groups map[str
 	} else {
 		query = query.Joins(spJoin)
 	}
-	query = query.Order("am.name, sp.inventory_id")
+	query = query.
+		Where("sp.stale = false").
+		Order("am.name, sp.inventory_id")
 
 	meta, links, err := UpdateMetaLinks(c, meta, total, nil, params...)
 	return query, meta, links, err