Fix cross-DB in specs of `retry_build_service_spec.rb`

The `retry_build_service_spec.rb` is fixed, but it has a code-path
that still uses in-transaction execution. Mark this execution
as allowed.

spec/services/ci/retry_build_service_spec.rb

@@ -371,6 +371,14 @@ RSpec.describe Ci::RetryBuildService do
       it_behaves_like 'when build with dynamic environment is retried'
 
       context 'when create_deployment_in_separate_transaction feature flag is disabled' do
+        let(:new_build) do
+          travel_to(1.second.from_now) do
+            ::Gitlab::Database::QueryAnalyzers::PreventCrossDatabaseModification.allow_cross_database_modification_within_transaction(url: 'https://gitlab.com/gitlab-org/gitlab/-/issues/345668') do
+              service.clone!(build)
+            end
+          end
+        end
+
         before do
           stub_feature_flags(create_deployment_in_separate_transaction: false)
         end

spec/support/database/cross-database-modification-allowlist.yml

-- "./spec/services/ci/retry_build_service_spec.rb"
+[]