fix(storage): add extra debug logging for GCS stat and blob transfer service

mentioned in commit 328d8198

mentioned in merge request gitlab-org/build/CNG!923 (merged)

mentioned in merge request gitlab-com/gl-infra/k8s-workloads/gitlab-com!1571 (merged)

mentioned in issue #620 (closed)

mentioned in merge request !944 (merged)

mentioned in merge request gitlab-com/gl-infra/k8s-workloads/gitlab-com!1602 (merged)

mentioned in merge request gitlab-org/charts/gitlab!2458 (merged)

mentioned in merge request omnibus-gitlab!6064 (merged)

mentioned in merge request gitlab-development-kit!2503 (merged)