frontend: Deduplicate namespaces from multi-cluster lists in autocomplete

Signed-off-by: kahirokunn <okinakahiro@gmail.com>

Author: kahirokunn

frontend/src/components/Sidebar/useSidebarItems.ts

@@ -91,12 +91,16 @@ export const useSidebarItems = (sidebarName: string = DefaultSidebars.IN_CLUSTER
         });
       } else {
         const entryGroup = entriesGroup.get(group)!;
-        entryGroup.subList?.push({
-          name: item.jsonData.metadata.name,
-          label: item.jsonData.spec.names.kind,
-          isCR: true,
-        });
-        //entryGroup.subList =
+        const subList = entryGroup.subList ?? (entryGroup.subList = []);
+        const crdName = item.jsonData.metadata.name;
+
+        if (!subList.some(subItem => subItem.name === crdName)) {
+          subList.push({
+            name: crdName,
+            label: item.jsonData.spec.names.kind,
+            isCR: true,
+          });
+        }
       }
     });
     entriesGroup.forEach(item => {