Export/import in batches during GitLab Migration
### Problem Related to https://gitlab.com/gitlab-org/gitlab/-/issues/365702#note_1122635380 The relation export job of CI pipelines often gets interrupted during GitLab migration. ### Proposed solution Let's look into changing the way we export, to export in batches, means more archive files. Instead of having 1 massive `tar.gz` file we'd have smaller batches. This solution would reduce the interruptions and the required disk space to export relations. Perhaps, we can use the source instance version to know whether the batch export is supported or not.
epic