fix: add graceful handling of backend errors in gcs storage driver Reader()

mentioned in issue #1604 (closed)

mentioned in commit ff993bd5

mentioned in merge request gitlab-org/charts/gitlab!4306 (merged)

mentioned in merge request gitlab-org/build/CNG!2411 (merged)

mentioned in merge request omnibus-gitlab!8461 (merged)

mentioned in merge request gitlab-com/gl-infra/k8s-workloads/gitlab-com!4459 (closed)

mentioned in merge request gitlab-com/gl-infra/k8s-workloads/gitlab-com!4460 (closed)

mentioned in merge request gitlab-com/gl-infra/k8s-workloads/gitlab-com!4461 (merged)

mentioned in merge request gitlab-org/charts/gitlab!4313 (closed)

mentioned in merge request gitlab-org/charts/gitlab!4315 (closed)

mentioned in merge request gitlab-org/build/CNG!2418 (merged)

mentioned in merge request omnibus-gitlab!8466 (merged)

mentioned in merge request gitlab-org/charts/gitlab!4319 (merged)

mentioned in merge request gitlab-org/charts/gitlab!4326 (closed)