Consume last_import_target in queries

* query last_import_target on source group fragment
* query last_import_target on set_import_progress mutation

app/assets/javascripts/import_entities/import_groups/graphql/fragments/bulk_import_source_group_item.fragment.graphql

@@ -12,6 +12,10 @@ fragment BulkImportSourceGroupItem on ClientBulkImportSourceGroup {
     target_namespace
     new_name
   }
+  last_import_target {
+    target_namespace
+    new_name
+  }
   validation_errors {
     field
     message

app/assets/javascripts/import_entities/import_groups/graphql/mutations/set_import_progress.mutation.graphql

-mutation setImportProgress($status: String!, $sourceGroupId: String!, $jobId: String) {
-  setImportProgress(status: $status, sourceGroupId: $sourceGroupId, jobId: $jobId) @client {
+mutation setImportProgress(
+  $status: String!
+  $sourceGroupId: String!
+  $jobId: String
+  $importTarget: ImportTargetInput!
+) {
+  setImportProgress(
+    status: $status
+    sourceGroupId: $sourceGroupId
+    jobId: $jobId
+    importTarget: $importTarget
+  ) @client {
     id
     progress {
       id
       status
     }
+    last_import_target {
+      target_namespace
+      new_name
+    }
   }
 }