feat(notifier): forward correlation ID for import notification

mentioned in commit 7ea0dd66

mentioned in issue #598 (closed)

mentioned in merge request gitlab-org/build/CNG!901 (merged)

mentioned in merge request gitlab-com/gl-infra/k8s-workloads/gitlab-com!1538 (merged)

mentioned in merge request gitlab-com/gl-infra/k8s-workloads/gitlab-com!1541 (merged)

mentioned in merge request gitlab-org/charts/gitlab!2401 (merged)

mentioned in merge request omnibus-gitlab!5925 (merged)