Create :correlation_id for `import_failures`

lib/gitlab/import_export/relation_tree_restorer.rb

@@ -94,7 +94,7 @@ module Gitlab
           relation_index: relation_index,
           exception_class: exception.class.to_s,
           exception_message: exception.message.truncate(255),
-          correlation_id_value: Labkit::Correlation::CorrelationId.current_id
+          correlation_id_value: Labkit::Correlation::CorrelationId.current_or_new_id
         )
       end

spec/lib/gitlab/import_export/project_tree_restorer_spec.rb

@@ -643,7 +643,9 @@ describe Gitlab::ImportExport::ProjectTreeRestorer do
     before do
       setup_import_export_config('with_invalid_records')
-      Labkit::Correlation::CorrelationId.use_id(correlation_id) { subject }
+      # Import is running from the rake task, `correlation_id` is not assigned
+      expect(Labkit::Correlation::CorrelationId).to receive(:new_id).and_return(correlation_id)
+      subject
     end
     context 'when failures occur because a relation fails to be processed' do