fix: Bulk URL Import Fixes (#2796)

* allow expections when fetching content

* removed extra bracket on import text

* added more fault tolerance and limited concurrency

* fix entries not being saved to report

* disable clicking into in-proress import

* conditionally render expansion

frontend/pages/group/reports/_id.vue

@@ -21,7 +21,7 @@
           {{ $d(Date.parse(item.timestamp), "short") }}
         </template>
         <template #expanded-item="{ headers, item }">
-          <td class="pa-6" :colspan="headers.length">{{ item.exception }}</td>
+          <td v-if="item.exception" class="pa-6" :colspan="headers.length">{{ item.exception }}</td>
         </template>
       </v-data-table>
     </v-container>