Reset database load balancing session before processing builds queue

ee/app/services/ee/ci/register_job_service.rb

@@ -28,6 +28,18 @@ module EE
         end
       end
 
+      def retrieve_queue(queue_query_proc)
+        if ::Feature.enabled?(:ci_runner_builds_queue_on_replicas, runner, default_enabled: :yaml)
+          ##
+          # We want to reset a load balancing session to discard the side
+          # effects of writes that could have happened prior to this moment.
+          #
+          ::Gitlab::Database::LoadBalancing::Session.clear_session
+        end
+
+        super
+      end
+
       def builds_for_shared_runner
         return super unless shared_runner_build_limits_feature_enabled?