Fix typo in RepositoryController#cleanup

Sentry error:
https://sentry.gitlab.net/gitlab/gitlabcom/issues/3173230

Use `result` instead of `status`

Changelog: fixed

app/controllers/projects/settings/repository_controller.rb

@@ -25,7 +25,7 @@ module Projects
         if result[:status] == :success
           flash[:notice] = _('Repository cleanup has started. You will receive an email once the cleanup operation is complete.')
         else
-          flash[:alert] = status.fetch(:message, _('Failed to upload object map file'))
+          flash[:alert] = result.fetch(:message, _('Failed to upload object map file'))
         end
 
         redirect_to project_settings_repository_path(project)

spec/controllers/projects/settings/repository_controller_spec.rb

@@ -33,6 +33,20 @@ RSpec.describe Projects::Settings::RepositoryController do
 
       expect(response).to redirect_to project_settings_repository_path(project)
     end
+
+    context 'when project cleanup returns an error', :aggregate_failures do
+      it 'shows an error' do
+        expect(Projects::CleanupService)
+          .to receive(:enqueue)
+          .with(project, user, anything)
+          .and_return(status: :error, message: 'error message')
+
+        put :cleanup, params: { namespace_id: project.namespace, project_id: project, project: { bfg_object_map: object_map } }
+
+        expect(controller).to set_flash[:alert].to('error message')
+        expect(response).to redirect_to project_settings_repository_path(project)
+      end
+    end
   end
 
   describe 'POST create_deploy_token' do