Project Import: Fix remote file download

A typo was introduced in
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/59033, which
pointed the download to the wrong variable.

Changelog: fixed
MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/61376

lib/gitlab/import_export/file_importer.rb

@@ -74,7 +74,7 @@ module Gitlab
         import_export_upload = @importable.import_export_upload
 
         if import_export_upload.remote_import_url.present?
-          download(remote_import_url, @archive_file)
+          download(import_export_upload.remote_import_url, @archive_file)
         else
           download_or_copy_upload(import_export_upload.import_file, @archive_file)
         end

spec/lib/gitlab/import_export/file_importer_spec.rb

@@ -71,6 +71,22 @@ RSpec.describe Gitlab::ImportExport::FileImporter do
     it 'creates the file in the right subfolder' do
       expect(shared.export_path).to include('test/abcd')
     end
+
+    context 'when the import file is remote' do
+      include AfterNextHelpers
+
+      it 'downloads the file from a remote object storage' do
+        file_url = 'https://remote.url/file'
+        import_export_upload = build(:import_export_upload, remote_import_url: file_url)
+        project = build( :project, import_export_upload: import_export_upload)
+
+        expect_next(described_class)
+          .to receive(:download)
+          .with(file_url, kind_of(String))
+
+        described_class.import(importable: project, archive_file: nil, shared: shared)
+      end
+    end
   end
 
   context 'error' do